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avformat/aiffdec: Use av_rescale() for bitrate 

Fixes: integer overflow
Fixes: 40313/clusterfuzz-testcase-minimized-ffmpeg_dem_AIFF_fuzzer-4814761406103552

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-10-31 00:11:23 +02:00
parent 93f7776921
commit 905588df97
1 changed files with 4 additions and 2 deletions
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6
libavformat/aiffdec.c
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@ -185,8 +185,10 @@ static int get_aiff_header(AVFormatContext *s, int size,
par->block_align = (av_get_bits_per_sample(par->codec_id) * par->channels) >> 3;
if (aiff->block_duration) {
par->bit_rate = (int64_t)par->sample_rate * (par->block_align << 3) /
aiff->block_duration;
par->bit_rate = av_rescale(par->sample_rate, par->block_align * 8LL,
aiff->block_duration);
if (par->bit_rate < 0)
par->bit_rate = 0;
}
/* Chunk is over */