[FFmpeg-cvslog] avformat/aiffdec: Use 64bit for block_duration use

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Sat Sep 17 16:32:09 2022 +0200| [e628454a43a0801adaada086fdb56d087013d614] | committer: Michael Niedermayer

avformat/aiffdec: Use 64bit for block_duration use

Fixes: signed integer overflow: 3 * -2147483648 cannot be represented in type 'int'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_AIFF_fuzzer-6668935979728896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 9303ba272e988d87084880c57056b750cc5ffd08)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e628454a43a0801adaada086fdb56d087013d614
---

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

diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index 25ad9151db..fa8989d5af 100644
--- a/libavformat/aiffdec.c
+++ b/libavformat/aiffdec.c
@@ -413,7 +413,7 @@ static int aiff_read_packet(AVFormatContext *s,
         pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
     /* Only one stream in an AIFF file */
     pkt->stream_index = 0;
-    pkt->duration     = (res / st->codecpar->block_align) * aiff->block_duration;
+    pkt->duration     = (res / st->codecpar->block_align) * (int64_t) aiff->block_duration;
     return 0;
 }