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avformat/bfi: Check chunk_header

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Fixes: signed integer overflow: -2147483648 - 3 cannot be represented in type 'int'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_BFI_fuzzer-6665764123836416

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 638a151a877c27a46c15643db26c9ba726feecde)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-14 18:41:41 +01:00
parent d72a06402c
commit 268f25c774
1 changed files with 3 additions and 0 deletions
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3
libavformat/bfi.c
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@ -69,6 +69,9 @@ static int bfi_read_header(AVFormatContext * s)
/* Set the total number of frames. */
avio_skip(pb, 8);
chunk_header = avio_rl32(pb);
if (chunk_header < 3)
return AVERROR_INVALIDDATA;
bfi->nframes = avio_rl32(pb);
avio_rl32(pb);
avio_rl32(pb);