[FFmpeg-devel] [PATCH 3/3] avformat/aiffdec: Use av_rescale() for bitrate

[Michael Niedermayer]

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
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/aiffdec.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index 648f231a523..7a995c00a66 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 */
-- 
2.17.1