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avformat/mpeg: Check an avio_read() for failure 

Fixes: use-of-uninitialized-value
Fixes: 70849/clusterfuzz-testcase-minimized-ffmpeg_dem_MPEGPS_fuzzer-4684401009557504

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 2024-08-04 21:27:44 +02:00
parent 8ca072a373
commit 66ee75d76c
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GPG Key ID: B18E8928B3948D64
1 changed files with 3 additions and 1 deletions
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4
libavformat/mpeg.c
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@ -566,7 +566,9 @@ redo:
static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
unsigned char buf[8];
avio_read(s->pb, buf, 8);
ret = avio_read(s->pb, buf, 8);
if (ret != 8)
return AVERROR_INVALIDDATA;
avio_seek(s->pb, -8, SEEK_CUR);
if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
codec_id = AV_CODEC_ID_CAVS;