[FFmpeg-cvslog] avcodec/apedec: Add k < 24 check to the only k++ case which lacks such a check

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Jun 16 11:26:57 2019 +0200| [3d4f4f4a15e79c96c3613e5c252b2f5cc4190e18] | committer: Michael Niedermayer

avcodec/apedec: Add k < 24 check to the only k++ case which lacks such a check

Fixes: 15255/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5718831688843264
Fixes: left shift of 1 by 31 places cannot be represented in type 'int'

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=3d4f4f4a15e79c96c3613e5c252b2f5cc4190e18
---

 libavcodec/apedec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 15eb416ba4..eb31fd70c1 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -460,7 +460,7 @@ static inline void update_rice(APERice *rice, unsigned int x)
 
     if (rice->ksum < lim)
         rice->k--;
-    else if (rice->ksum >= (1 << (rice->k + 5)))
+    else if (rice->ksum >= (1 << (rice->k + 5)) && rice->k < 24)
         rice->k++;
 }