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FFmpeg/libavformat/aaxdec.c
Michael Niedermayer db31b3ea86 avformat/aaxdec: Check for empty segments 
Fixes: Timeout
Fixes: 48154/clusterfuzz-testcase-minimized-ffmpeg_dem_AAX_fuzzer-5149094353436672

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-07-12 21:55:22 +02:00

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/*
* AAX demuxer
* Copyright (c) 2020 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
typedef struct AAXColumn {
uint8_t flag;
uint8_t type;
const char *name;
uint32_t offset;
int size;
} AAXColumn;
typedef struct AAXSegment {
int64_t start;
int64_t end;
} AAXSegment;
typedef struct AAXContext {
int64_t table_size;
uint16_t version;
int64_t rows_offset;
int64_t strings_offset;
int64_t data_offset;
int64_t name_offset;
uint16_t columns;
uint16_t row_width;
uint32_t nb_segments;
int64_t schema_offset;
int64_t strings_size;
char *string_table;
uint32_t current_segment;
AAXColumn *xcolumns;
AAXSegment *segments;
} AAXContext;
static int aax_probe(const AVProbeData *p)
{
if (AV_RB32(p->buf) != MKBETAG('@','U','T','F'))
return 0;
if (AV_RB32(p->buf + 4) == 0)
return 0;
if (AV_RB16(p->buf + 8) > 1)
return 0;
if (AV_RB32(p->buf + 28) < 1)
return 0;
return AVPROBE_SCORE_MAX;
}
enum ColumnFlag {
COLUMN_FLAG_NAME = 0x1,
COLUMN_FLAG_DEFAULT = 0x2,
COLUMN_FLAG_ROW = 0x4,
COLUMN_FLAG_UNDEFINED = 0x8 /* shouldn't exist */
};
enum ColumnType {
COLUMN_TYPE_UINT8 = 0x00,
COLUMN_TYPE_SINT8 = 0x01,
COLUMN_TYPE_UINT16 = 0x02,
COLUMN_TYPE_SINT16 = 0x03,
COLUMN_TYPE_UINT32 = 0x04,
COLUMN_TYPE_SINT32 = 0x05,
COLUMN_TYPE_UINT64 = 0x06,
COLUMN_TYPE_SINT64 = 0x07,
COLUMN_TYPE_FLOAT = 0x08,
COLUMN_TYPE_DOUBLE = 0x09,
COLUMN_TYPE_STRING = 0x0a,
COLUMN_TYPE_VLDATA = 0x0b,
COLUMN_TYPE_UINT128 = 0x0c, /* for GUIDs */
COLUMN_TYPE_UNDEFINED = -1
};
static int64_t get_pts(AVFormatContext *s, int64_t pos, int size)
{
AAXContext *a = s->priv_data;
int64_t pts = 0;
for (int seg = 0; seg < a->current_segment; seg++)
pts += (a->segments[seg].end - a->segments[seg].start) / size;
pts += ((pos - a->segments[a->current_segment].start) / size);
return pts;
}
static int aax_read_header(AVFormatContext *s)
{
AAXContext *a = s->priv_data;
AVIOContext *pb = s->pb;
AVCodecParameters *par;
AVStream *st;
int64_t column_offset = 0;
int ret, extradata_size;
char *codec;
int64_t ret64;
avio_skip(pb, 4);
a->table_size = avio_rb32(pb) + 8LL;
a->version = avio_rb16(pb);
a->rows_offset = avio_rb16(pb) + 8LL;
a->strings_offset = avio_rb32(pb) + 8LL;
a->data_offset = avio_rb32(pb) + 8LL;
a->name_offset = avio_rb32(pb);
a->columns = avio_rb16(pb);
a->row_width = avio_rb16(pb);
a->nb_segments = avio_rb32(pb);
if (a->nb_segments < 1)
return AVERROR_INVALIDDATA;
a->schema_offset = 0x20;
a->strings_size = a->data_offset - a->strings_offset;
if (a->rows_offset > a->table_size ||
a->strings_offset > a->table_size ||
a->data_offset > a->table_size)
return AVERROR_INVALIDDATA;
if (a->strings_size <= 0 || a->name_offset >= a->strings_size ||
a->strings_size > UINT16_MAX)
return AVERROR_INVALIDDATA;
if (a->columns <= 0)
return AVERROR_INVALIDDATA;
a->segments = av_calloc(a->nb_segments, sizeof(*a->segments));
if (!a->segments)
return AVERROR(ENOMEM);
a->xcolumns = av_calloc(a->columns, sizeof(*a->xcolumns));
if (!a->xcolumns)
return AVERROR(ENOMEM);
a->string_table = av_calloc(a->strings_size + 1, sizeof(*a->string_table));
if (!a->string_table)
return AVERROR(ENOMEM);
for (int c = 0; c < a->columns; c++) {
uint8_t info = avio_r8(pb);
uint32_t offset = avio_rb32(pb);
int value_size;
if (offset >= a->strings_size)
return AVERROR_INVALIDDATA;
a->xcolumns[c].flag = info >> 4;
a->xcolumns[c].type = info & 0x0F;
switch (a->xcolumns[c].type) {
case COLUMN_TYPE_UINT8:
case COLUMN_TYPE_SINT8:
value_size = 0x01;
break;
case COLUMN_TYPE_UINT16:
case COLUMN_TYPE_SINT16:
value_size = 0x02;
break;
case COLUMN_TYPE_UINT32:
case COLUMN_TYPE_SINT32:
case COLUMN_TYPE_FLOAT:
case COLUMN_TYPE_STRING:
value_size = 0x04;
break;
case COLUMN_TYPE_VLDATA:
value_size = 0x08;
break;
case COLUMN_TYPE_UINT128:
value_size = 0x10;
break;
default:
return AVERROR_INVALIDDATA;
}
a->xcolumns[c].size = value_size;
if (a->xcolumns[c].flag & COLUMN_FLAG_NAME)
a->xcolumns[c].name = a->string_table + offset;
if (a->xcolumns[c].flag & COLUMN_FLAG_DEFAULT) {
/* data is found relative to columns start */
a->xcolumns[c].offset = avio_tell(pb) - a->schema_offset;
avio_skip(pb, value_size);
}
if (a->xcolumns[c].flag & COLUMN_FLAG_ROW) {
/* data is found relative to row start */
a->xcolumns[c].offset = column_offset;
column_offset += value_size;
}
}
ret = ret64 = avio_seek(pb, a->strings_offset, SEEK_SET);
if (ret64 < 0)
return ret;
ret = ffio_read_size(pb, a->string_table, a->strings_size);
if (ret < 0)
return ret;
for (int c = 0; c < a->columns; c++) {
int64_t data_offset = 0;
int64_t col_offset;
int flag, type;
if (!a->xcolumns[c].name || strcmp(a->xcolumns[c].name, "data"))
continue;
type = a->xcolumns[c].type;
flag = a->xcolumns[c].flag;
col_offset = a->xcolumns[c].offset;
for (uint64_t r = 0; r < a->nb_segments; r++) {
if (flag & COLUMN_FLAG_DEFAULT) {
data_offset = a->schema_offset + col_offset;
} else if (flag & COLUMN_FLAG_ROW) {
data_offset = a->rows_offset + r * a->row_width + col_offset;
} else
return AVERROR_INVALIDDATA;
ret = ret64 = avio_seek(pb, data_offset, SEEK_SET);
if (ret64 < 0)
return ret;
if (type == COLUMN_TYPE_VLDATA) {
int64_t start, size;
start = avio_rb32(pb);
size = avio_rb32(pb);
if (!size)
return AVERROR_INVALIDDATA;
a->segments[r].start = start + a->data_offset;
a->segments[r].end = a->segments[r].start + size;
if (r &&
a->segments[r].start < a->segments[r-1].end &&
a->segments[r].end > a->segments[r-1].start)
return AVERROR_INVALIDDATA;
} else
return AVERROR_INVALIDDATA;
}
}
if (!a->segments[0].end)
return AVERROR_INVALIDDATA;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->start_time = 0;
par = s->streams[0]->codecpar;
par->codec_type = AVMEDIA_TYPE_AUDIO;
codec = a->string_table + a->name_offset;
if (!strcmp(codec, "AAX")) {
par->codec_id = AV_CODEC_ID_ADPCM_ADX;
ret64 = avio_seek(pb, a->segments[0].start, SEEK_SET);
if (ret64 < 0 || avio_rb16(pb) != 0x8000)
return AVERROR_INVALIDDATA;
extradata_size = avio_rb16(pb) + 4;
if (extradata_size < 12)
return AVERROR_INVALIDDATA;
avio_seek(pb, -4, SEEK_CUR);
ret = ff_get_extradata(s, par, pb, extradata_size);
if (ret < 0)
return ret;
par->ch_layout.nb_channels = AV_RB8 (par->extradata + 7);
par->sample_rate = AV_RB32(par->extradata + 8);
if (!par->ch_layout.nb_channels || !par->sample_rate)
return AVERROR_INVALIDDATA;
avpriv_set_pts_info(st, 64, 32, par->sample_rate);
/*} else if (!strcmp(codec, "HCA") ){
par->codec_id = AV_CODEC_ID_HCA;*/
} else {
return AVERROR_INVALIDDATA;
}
return 0;
}
static int aax_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AAXContext *a = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
AVIOContext *pb = s->pb;
const int size = 18 * par->ch_layout.nb_channels;
int ret, extradata_size = 0;
uint8_t *extradata = NULL;
int skip = 0;
if (avio_feof(pb))
return AVERROR_EOF;
pkt->pos = avio_tell(pb);
for (uint32_t seg = 0; seg < a->nb_segments; seg++) {
int64_t start = a->segments[seg].start;
int64_t end = a->segments[seg].end;
if (pkt->pos >= start && pkt->pos <= end) {
a->current_segment = seg;
if (par->codec_id == AV_CODEC_ID_ADPCM_ADX)
skip = (end - start) - ((end - start) / size) * size;
break;
}
}
if (pkt->pos >= a->segments[a->current_segment].end - skip) {
if (a->current_segment + 1 == a->nb_segments)
return AVERROR_EOF;
a->current_segment++;
avio_seek(pb, a->segments[a->current_segment].start, SEEK_SET);
if (par->codec_id == AV_CODEC_ID_ADPCM_ADX) {
if (avio_rb16(pb) != 0x8000)
return AVERROR_INVALIDDATA;
extradata_size = avio_rb16(pb) + 4;
avio_seek(pb, -4, SEEK_CUR);
if (extradata_size < 12)
return AVERROR_INVALIDDATA;
extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata)
return AVERROR(ENOMEM);
if (avio_read(pb, extradata, extradata_size) != extradata_size) {
av_free(extradata);
return AVERROR(EIO);
}
memset(extradata + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
}
ret = av_get_packet(pb, pkt, size);
if (ret != size) {
av_free(extradata);
return ret < 0 ? ret : AVERROR(EIO);
}
pkt->duration = 1;
pkt->stream_index = 0;
pkt->pts = get_pts(s, pkt->pos, size);
if (extradata) {
ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, extradata, extradata_size);
if (ret < 0) {
av_free(extradata);
return ret;
}
}
return ret;
}
static int aax_read_close(AVFormatContext *s)
{
AAXContext *a = s->priv_data;
av_freep(&a->segments);
av_freep(&a->xcolumns);
av_freep(&a->string_table);
return 0;
}
const AVInputFormat ff_aax_demuxer = {
.name = "aax",
.long_name = NULL_IF_CONFIG_SMALL("CRI AAX"),
.priv_data_size = sizeof(AAXContext),
.flags_internal = FF_FMT_INIT_CLEANUP,
.read_probe = aax_probe,
.read_header = aax_read_header,
.read_packet = aax_read_packet,
.read_close = aax_read_close,
.extensions = "aax",
.flags = AVFMT_GENERIC_INDEX,
};
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