[FFmpeg-cvslog] avcodec/utils: Check sample rate before use for AV_CODEC_ID_BINKAUDIO_DCT in get_audio_frame_duration()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Oct 27 17:21:19 2020 +0100| [ec7e0d42884b40ce93b6b5e94de5f7849310f8a0] | committer: Michael Niedermayer

avcodec/utils: Check sample rate before use for AV_CODEC_ID_BINKAUDIO_DCT in get_audio_frame_duration()

Fixes: shift exponent 95 is too large for 32-bit type 'int'
Fixes: 26590/clusterfuzz-testcase-minimized-ffmpeg_dem_SMACKER_fuzzer-5120609937522688

Reviewed-by: Peter Ross <pross at xvid.org>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ec7e0d42884b40ce93b6b5e94de5f7849310f8a0
---

 libavcodec/utils.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index fb40962c47..110496cc44 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -1633,8 +1633,11 @@ static int get_audio_frame_duration(enum AVCodecID id, int sr, int ch, int ba,
 
         if (ch > 0) {
             /* calc from sample rate and channels */
-            if (id == AV_CODEC_ID_BINKAUDIO_DCT)
+            if (id == AV_CODEC_ID_BINKAUDIO_DCT) {
+                if (sr / 22050 > 22)
+                    return 0;
                 return (480 << (sr / 22050)) / ch;
+            }
         }
 
         if (id == AV_CODEC_ID_MP3)