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avformat/wtvdec: Check length of read mpeg2_descriptor 

Fixes: Use of uninitialized value
Fixes: 70900/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-6286909377150976

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-08-07 00:18:53 +02:00
parent c95ea03104
commit c390234da2
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1 changed files with 2 additions and 1 deletions
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libavformat/wtvdec.c
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@ -846,7 +846,8 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
}
buf_size = FFMIN(len - consumed, sizeof(buf));
avio_read(pb, buf, buf_size);
if (avio_read(pb, buf, buf_size) != buf_size)
return AVERROR_INVALIDDATA;
consumed += buf_size;
ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
}