mirror of
https://github.com/FFmpeg/FFmpeg.git
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c900f2e42c
Fixes: NULL pointer dereference Fixes: 44884/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4656748688965632 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
226 lines
6.1 KiB
C
226 lines
6.1 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "config.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/bytestream.h"
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#include "libavformat/avformat.h"
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typedef struct IOContext {
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int64_t pos;
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int64_t filesize;
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uint8_t *fuzz;
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int fuzz_size;
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} IOContext;
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
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int64_t interrupt_counter;
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static int interrupt_cb(void *ctx)
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{
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interrupt_counter --;
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return interrupt_counter < 0;
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}
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static void error(const char *err)
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{
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fprintf(stderr, "%s", err);
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exit(1);
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}
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static int io_read(void *opaque, uint8_t *buf, int buf_size)
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{
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IOContext *c = opaque;
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int size = FFMIN(buf_size, c->fuzz_size);
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if (!c->fuzz_size) {
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c->filesize = FFMIN(c->pos, c->filesize);
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return AVERROR_EOF;
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}
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if (c->pos > INT64_MAX - size)
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return AVERROR(EIO);
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memcpy(buf, c->fuzz, size);
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c->fuzz += size;
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c->fuzz_size -= size;
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c->pos += size;
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c->filesize = FFMAX(c->filesize, c->pos);
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return size;
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}
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static int64_t io_seek(void *opaque, int64_t offset, int whence)
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{
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IOContext *c = opaque;
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if (whence == SEEK_CUR) {
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if (offset > INT64_MAX - c->pos)
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return -1;
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offset += c->pos;
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} else if (whence == SEEK_END) {
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if (offset > INT64_MAX - c->filesize)
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return -1;
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offset += c->filesize;
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} else if (whence == AVSEEK_SIZE) {
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return c->filesize;
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}
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if (offset < 0 || offset > c->filesize)
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return -1;
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if (IO_FLAT) {
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c->fuzz += offset - c->pos;
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c->fuzz_size -= offset - c->pos;
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}
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c->pos = offset;
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return 0;
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}
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// Ensure we don't loop forever
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const uint32_t maxiteration = 8096;
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const int maxblocks= 50000;
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static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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const uint64_t fuzz_tag = FUZZ_TAG;
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uint32_t it = 0;
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AVFormatContext *avfmt = avformat_alloc_context();
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AVPacket *pkt;
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char filename[1025] = {0};
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AVIOContext *fuzzed_pb = NULL;
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uint8_t *io_buffer;
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int io_buffer_size = 32768;
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int64_t filesize = size;
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IOContext opaque;
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static int c;
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int seekable = 0;
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int ret;
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AVInputFormat *fmt = NULL;
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#ifdef FFMPEG_DEMUXER
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#define DEMUXER_SYMBOL0(DEMUXER) ff_##DEMUXER##_demuxer
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#define DEMUXER_SYMBOL(DEMUXER) DEMUXER_SYMBOL0(DEMUXER)
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extern AVInputFormat DEMUXER_SYMBOL(FFMPEG_DEMUXER);
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fmt = &DEMUXER_SYMBOL(FFMPEG_DEMUXER);
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#endif
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if (!c) {
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av_log_set_level(AV_LOG_PANIC);
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c=1;
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}
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if (!avfmt)
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error("Failed avformat_alloc_context()");
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if (IO_FLAT) {
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seekable = 1;
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io_buffer_size = size;
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} else if (size > 2048) {
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int flags;
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char extension[64];
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GetByteContext gbc;
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memcpy (filename, data + size - 1024, 1024);
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bytestream2_init(&gbc, data + size - 2048, 1024);
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size -= 2048;
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io_buffer_size = bytestream2_get_le32(&gbc) & 0xFFFFFFF;
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flags = bytestream2_get_byte(&gbc);
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seekable = flags & 1;
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filesize = bytestream2_get_le64(&gbc) & 0x7FFFFFFFFFFFFFFF;
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if ((flags & 2) && strlen(filename) < sizeof(filename) / 2) {
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const AVInputFormat *avif = NULL;
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void *avif_iter = NULL;
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int avif_count = 0;
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while ((avif = av_demuxer_iterate(&avif_iter))) {
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if (avif->extensions)
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avif_count ++;
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}
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avif_count = bytestream2_get_le32(&gbc) % avif_count;
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avif_iter = NULL;
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while ((avif = av_demuxer_iterate(&avif_iter))) {
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if (avif->extensions)
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if (!avif_count--)
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break;
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}
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av_strlcpy(extension, avif->extensions, sizeof(extension));
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if (strchr(extension, ','))
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*strchr(extension, ',') = 0;
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av_strlcatf(filename, sizeof(filename), ".%s", extension);
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}
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interrupt_counter = bytestream2_get_le32(&gbc);
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avfmt->interrupt_callback.callback = interrupt_cb;
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}
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// HLS uses a loop with sleep, we thus must breakout or we timeout
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if (fmt && !strcmp(fmt->name, "hls"))
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interrupt_counter &= 31;
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if (!io_buffer_size || size / io_buffer_size > maxblocks)
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io_buffer_size = size;
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pkt = av_packet_alloc();
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if (!pkt)
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error("Failed to allocate pkt");
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io_buffer = av_malloc(io_buffer_size);
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if (!io_buffer)
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error("Failed to allocate io_buffer");
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opaque.filesize = filesize;
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opaque.pos = 0;
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opaque.fuzz = data;
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opaque.fuzz_size= size;
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fuzzed_pb = avio_alloc_context(io_buffer, io_buffer_size, 0, &opaque,
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io_read, NULL, seekable ? io_seek : NULL);
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if (!fuzzed_pb)
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error("avio_alloc_context failed");
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avfmt->pb = fuzzed_pb;
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ret = avformat_open_input(&avfmt, filename, fmt, NULL);
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if (ret < 0) {
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goto fail;
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}
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ret = avformat_find_stream_info(avfmt, NULL);
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//TODO, test seeking
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for(it = 0; it < maxiteration; it++) {
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ret = av_read_frame(avfmt, pkt);
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if (ret < 0)
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break;
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av_packet_unref(pkt);
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}
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fail:
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av_packet_free(&pkt);
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av_freep(&fuzzed_pb->buffer);
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avio_context_free(&fuzzed_pb);
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avformat_close_input(&avfmt);
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return 0;
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}
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