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avformat/avidec: Use 64bit in get_duration()

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Fixes: signed integer overflow: 2147483424 + 8224 cannot be represented in type 'int'
Fixes: 29619/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-5191424373030912

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 2021-01-31 16:30:59 +01:00
parent 658f0606cb
commit a0ceb0cdd4
1 changed files with 1 additions and 1 deletions
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libavformat/avidec.c
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@ -135,7 +135,7 @@ static inline int get_duration(AVIStream *ast, int len)
if (ast->sample_size)
return len;
else if (ast->dshow_block_align)
return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
return (len + (int64_t)ast->dshow_block_align - 1) / ast->dshow_block_align;
else
return 1;
}