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avformat/ads: Check size

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Fixes: signed integer overflow: -2147483616 - 64 cannot be represented in type 'int'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_ADS_fuzzer-6617769344892928

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-14 18:38:16 +01:00
parent b17ffe8f8f
commit c78b2b138c
1 changed files with 3 additions and 2 deletions
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5
libavformat/ads.c
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@ -34,8 +34,9 @@ static int ads_probe(const AVProbeData *p)
static int ads_read_header(AVFormatContext *s) static int ads_read_header(AVFormatContext *s)
{ {
int align, codec, size; int align, codec;
AVStream *st; AVStream *st;
int64_t size;
st = avformat_new_stream(s, NULL); st = avformat_new_stream(s, NULL);
if (!st) if (!st)
@ -62,7 +63,7 @@ static int ads_read_header(AVFormatContext *s)
st->codecpar->block_align = st->codecpar->channels * align; st->codecpar->block_align = st->codecpar->channels * align;
avio_skip(s->pb, 12); avio_skip(s->pb, 12);
size = avio_rl32(s->pb); size = avio_rl32(s->pb);
if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_PSX) if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_PSX && size >= 0x40)
st->duration = (size - 0x40) / 16 / st->codecpar->channels * 28; st->duration = (size - 0x40) / 16 / st->codecpar->channels * 28;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);