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https://github.com/FFmpeg/FFmpeg.git
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d34a133b78
DDS1 chunks are decoded in 2x2 blocks, odd chunk width or height is not allowed in that case. Also ensure that the decode buffer is big enough for all blocks being processed. Bug-Id: CVE-2017-9992 CC: libav-stable@libav.org
411 lines
13 KiB
C
411 lines
13 KiB
C
/*
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* Chronomaster DFA Video Decoder
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* Copyright (c) 2011 Konstantin Shishkov
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* based on work by Vladimir "VAG" Gneushev
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/mem.h"
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typedef struct DfaContext {
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uint32_t pal[256];
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uint8_t *frame_buf;
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} DfaContext;
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static av_cold int dfa_decode_init(AVCodecContext *avctx)
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{
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DfaContext *s = avctx->priv_data;
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int ret;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
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return ret;
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s->frame_buf = av_mallocz(avctx->width * avctx->height);
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if (!s->frame_buf)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int decode_copy(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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const int size = width * height;
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if (bytestream2_get_buffer(gb, frame, size) != size)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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const uint8_t *frame_start = frame;
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const uint8_t *frame_end = frame + width * height;
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int mask = 0x10000, bitbuf = 0;
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int v, count, segments;
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unsigned offset;
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segments = bytestream2_get_le32(gb);
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offset = bytestream2_get_le32(gb);
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if (frame_end - frame <= offset)
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return AVERROR_INVALIDDATA;
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frame += offset;
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while (segments--) {
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if (bytestream2_get_bytes_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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if (mask == 0x10000) {
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bitbuf = bytestream2_get_le16u(gb);
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mask = 1;
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}
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if (frame_end - frame < 2)
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return AVERROR_INVALIDDATA;
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if (bitbuf & mask) {
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v = bytestream2_get_le16(gb);
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offset = (v & 0x1FFF) << 1;
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count = ((v >> 13) + 2) << 1;
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if (frame - frame_start < offset || frame_end - frame < count)
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return AVERROR_INVALIDDATA;
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av_memcpy_backptr(frame, offset, count);
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frame += count;
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} else {
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*frame++ = bytestream2_get_byte(gb);
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*frame++ = bytestream2_get_byte(gb);
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}
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mask <<= 1;
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}
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return 0;
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}
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static int decode_dsw1(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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const uint8_t *frame_start = frame;
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const uint8_t *frame_end = frame + width * height;
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int mask = 0x10000, bitbuf = 0;
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int v, offset, count, segments;
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segments = bytestream2_get_le16(gb);
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while (segments--) {
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if (bytestream2_get_bytes_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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if (mask == 0x10000) {
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bitbuf = bytestream2_get_le16u(gb);
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mask = 1;
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}
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if (frame_end - frame < 2)
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return AVERROR_INVALIDDATA;
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if (bitbuf & mask) {
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v = bytestream2_get_le16(gb);
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offset = (v & 0x1FFF) << 1;
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count = ((v >> 13) + 2) << 1;
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if (frame - frame_start < offset || frame_end - frame < count)
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return AVERROR_INVALIDDATA;
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av_memcpy_backptr(frame, offset, count);
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frame += count;
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} else if (bitbuf & (mask << 1)) {
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frame += bytestream2_get_le16(gb);
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} else {
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*frame++ = bytestream2_get_byte(gb);
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*frame++ = bytestream2_get_byte(gb);
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}
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mask <<= 2;
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}
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return 0;
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}
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static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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const uint8_t *frame_start = frame;
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const uint8_t *frame_end = frame + width * height;
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int mask = 0x10000, bitbuf = 0;
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int i, v, offset, count, segments;
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if ((width | height) & 1)
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return AVERROR_INVALIDDATA;
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segments = bytestream2_get_le16(gb);
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while (segments--) {
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if (bytestream2_get_bytes_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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if (mask == 0x10000) {
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bitbuf = bytestream2_get_le16u(gb);
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mask = 1;
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}
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if (bitbuf & mask) {
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v = bytestream2_get_le16(gb);
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offset = (v & 0x1FFF) << 2;
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count = ((v >> 13) + 2) << 1;
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if (frame - frame_start < offset || frame_end - frame < count*2 + width)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < count; i++) {
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frame[0] = frame[1] =
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frame[width] = frame[width + 1] = frame[-offset];
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frame += 2;
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}
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} else if (bitbuf & (mask << 1)) {
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v = bytestream2_get_le16(gb)*2;
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if (frame - frame_end < v)
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return AVERROR_INVALIDDATA;
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frame += v;
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} else {
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if (width < 4 || frame_end - frame < width + 4)
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return AVERROR_INVALIDDATA;
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frame[0] = frame[1] =
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frame[width] = frame[width + 1] = bytestream2_get_byte(gb);
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frame += 2;
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frame[0] = frame[1] =
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frame[width] = frame[width + 1] = bytestream2_get_byte(gb);
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frame += 2;
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}
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mask <<= 2;
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}
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return 0;
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}
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static int decode_bdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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uint8_t *line_ptr;
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int count, lines, segments;
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count = bytestream2_get_le16(gb);
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if (count >= height)
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return AVERROR_INVALIDDATA;
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frame += width * count;
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lines = bytestream2_get_le16(gb);
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if (count + lines > height)
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return AVERROR_INVALIDDATA;
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while (lines--) {
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if (bytestream2_get_bytes_left(gb) < 1)
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return AVERROR_INVALIDDATA;
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line_ptr = frame;
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frame += width;
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segments = bytestream2_get_byteu(gb);
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while (segments--) {
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if (frame - line_ptr <= bytestream2_peek_byte(gb))
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return AVERROR_INVALIDDATA;
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line_ptr += bytestream2_get_byte(gb);
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count = (int8_t)bytestream2_get_byte(gb);
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if (count >= 0) {
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if (frame - line_ptr < count)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_buffer(gb, line_ptr, count) != count)
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return AVERROR_INVALIDDATA;
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} else {
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count = -count;
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if (frame - line_ptr < count)
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return AVERROR_INVALIDDATA;
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memset(line_ptr, bytestream2_get_byte(gb), count);
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}
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line_ptr += count;
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}
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}
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return 0;
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}
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static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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const uint8_t *frame_end = frame + width * height;
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uint8_t *line_ptr;
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int count, i, v, lines, segments;
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int y = 0;
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lines = bytestream2_get_le16(gb);
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if (lines > height)
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return AVERROR_INVALIDDATA;
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while (lines--) {
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if (bytestream2_get_bytes_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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segments = bytestream2_get_le16u(gb);
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while ((segments & 0xC000) == 0xC000) {
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unsigned skip_lines = -(int16_t)segments;
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unsigned delta = -((int16_t)segments * width);
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if (frame_end - frame <= delta || y + lines + skip_lines > height)
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return AVERROR_INVALIDDATA;
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frame += delta;
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y += skip_lines;
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segments = bytestream2_get_le16(gb);
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}
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if (segments & 0x8000) {
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frame[width - 1] = segments & 0xFF;
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segments = bytestream2_get_le16(gb);
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}
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line_ptr = frame;
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if (frame_end - frame < width)
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return AVERROR_INVALIDDATA;
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frame += width;
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y++;
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while (segments--) {
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if (frame - line_ptr <= bytestream2_peek_byte(gb))
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return AVERROR_INVALIDDATA;
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line_ptr += bytestream2_get_byte(gb);
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count = (int8_t)bytestream2_get_byte(gb);
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if (count >= 0) {
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if (frame - line_ptr < count * 2)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_buffer(gb, line_ptr, count * 2) != count * 2)
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return AVERROR_INVALIDDATA;
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line_ptr += count * 2;
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} else {
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count = -count;
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if (frame - line_ptr < count * 2)
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return AVERROR_INVALIDDATA;
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v = bytestream2_get_le16(gb);
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for (i = 0; i < count; i++)
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bytestream_put_le16(&line_ptr, v);
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}
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}
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}
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return 0;
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}
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static int decode_tdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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const uint8_t *frame_end = frame + width * height;
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int segments = bytestream2_get_le32(gb);
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int skip, copy;
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while (segments--) {
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if (bytestream2_get_bytes_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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copy = bytestream2_get_byteu(gb) * 2;
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skip = bytestream2_get_byteu(gb) * 2;
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if (frame_end - frame < copy + skip ||
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bytestream2_get_bytes_left(gb) < copy)
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return AVERROR_INVALIDDATA;
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frame += skip;
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bytestream2_get_buffer(gb, frame, copy);
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frame += copy;
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}
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return 0;
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}
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static int decode_blck(GetByteContext *gb, uint8_t *frame, int width, int height)
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{
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memset(frame, 0, width * height);
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return 0;
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}
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typedef int (*chunk_decoder)(GetByteContext *gb, uint8_t *frame, int width, int height);
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static const chunk_decoder decoder[8] = {
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decode_copy, decode_tsw1, decode_bdlt, decode_wdlt,
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decode_tdlt, decode_dsw1, decode_blck, decode_dds1,
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};
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static const char * const chunk_name[8] = {
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"COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1"
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};
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static int dfa_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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AVFrame *frame = data;
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DfaContext *s = avctx->priv_data;
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GetByteContext gb;
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const uint8_t *buf = avpkt->data;
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uint32_t chunk_type, chunk_size;
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uint8_t *dst;
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int ret;
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int i, pal_elems;
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if ((ret = ff_get_buffer(avctx, frame, 0))) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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while (bytestream2_get_bytes_left(&gb) > 0) {
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bytestream2_skip(&gb, 4);
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chunk_size = bytestream2_get_le32(&gb);
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chunk_type = bytestream2_get_le32(&gb);
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if (!chunk_type)
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break;
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if (chunk_type == 1) {
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pal_elems = FFMIN(chunk_size / 3, 256);
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for (i = 0; i < pal_elems; i++) {
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s->pal[i] = bytestream2_get_be24(&gb) << 2;
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s->pal[i] |= (s->pal[i] >> 6) & 0x333;
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}
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frame->palette_has_changed = 1;
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} else if (chunk_type <= 9) {
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if (decoder[chunk_type - 2](&gb, s->frame_buf, avctx->width, avctx->height)) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n",
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chunk_name[chunk_type - 2]);
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return AVERROR_INVALIDDATA;
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}
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} else {
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av_log(avctx, AV_LOG_WARNING,
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"Ignoring unknown chunk type %"PRIu32"\n",
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chunk_type);
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}
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buf += chunk_size;
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}
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buf = s->frame_buf;
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dst = frame->data[0];
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for (i = 0; i < avctx->height; i++) {
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memcpy(dst, buf, avctx->width);
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dst += frame->linesize[0];
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buf += avctx->width;
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}
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memcpy(frame->data[1], s->pal, sizeof(s->pal));
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int dfa_decode_end(AVCodecContext *avctx)
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{
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DfaContext *s = avctx->priv_data;
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av_freep(&s->frame_buf);
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return 0;
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}
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AVCodec ff_dfa_decoder = {
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.name = "dfa",
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.long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_DFA,
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.priv_data_size = sizeof(DfaContext),
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.init = dfa_decode_init,
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.close = dfa_decode_end,
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.decode = dfa_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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