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avformat/pcm: Use 64bit in bitrate computation 

Fixes: signed integer overflow: 65792 * 65312 cannot be represented in type 'int'
Fixes: 67819/clusterfuzz-testcase-minimized-ffmpeg_dem_WADY_fuzzer-5236100912185344

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 2024-04-04 00:42:20 +02:00
parent ed49391961
commit bf3b74142e
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1 changed files with 1 additions and 1 deletions
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libavformat/pcm.c
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@ -41,7 +41,7 @@ int ff_pcm_default_packet_size(AVCodecParameters *par)
/* Don't trust the codecpar bitrate if we can calculate it ourselves */
if (bits_per_sample > 0 && par->sample_rate > 0 && par->ch_layout.nb_channels > 0)
if ((int64_t)par->sample_rate * par->ch_layout.nb_channels < INT64_MAX / bits_per_sample)
bitrate = bits_per_sample * par->sample_rate * par->ch_layout.nb_channels;
bitrate = bits_per_sample * (int64_t)par->sample_rate * par->ch_layout.nb_channels;
if (bitrate > 0) {
nb_samples = av_clip64(bitrate / 8 / PCM_DEMUX_TARGET_FPS / par->block_align, 1, max_samples);