[FFmpeg-cvslog] avformat/mov: Check sample size for overflow in mov_parse_stsd_audio()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Mar 17 23:39:04 2021 +0100| [d35677736a59ec6579b4da63d9b1444986ba339e] | committer: Michael Niedermayer

avformat/mov: Check sample size for overflow in mov_parse_stsd_audio()

Fixes: signed integer overflow: 2 * 1914708000 cannot be represented in type 'int'
Fixes: 31639/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6303428239294464

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d35677736a59ec6579b4da63d9b1444986ba339e
---

 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index aef5517c2c..b90cec7173 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2263,7 +2263,7 @@ static void mov_parse_stsd_audio(MOVContext *c, AVIOContext *pb,
     }
 
     bits_per_sample = av_get_bits_per_sample(st->codecpar->codec_id);
-    if (bits_per_sample) {
+    if (bits_per_sample && (bits_per_sample >> 3) * (uint64_t)st->codecpar->channels <= INT_MAX) {
         st->codecpar->bits_per_coded_sample = bits_per_sample;
         sc->sample_size = (bits_per_sample >> 3) * st->codecpar->channels;
     }