From 905588df975071c03c00b2e923c311b4de65a8f4 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 31 Oct 2021 00:11:23 +0200 Subject: [PATCH] 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 Signed-off-by: Michael Niedermayer --- libavformat/aiffdec.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c index 648f231a52..7a995c00a6 100644 --- a/libavformat/aiffdec.c +++ b/libavformat/aiffdec.c @@ -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 */