[FFmpeg-cvslog] avcodec/takdec: Fix integer overflow in decorrelate()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug 25 17:49:15 2019 +0200| [f1192736494a5b16717de66da4a3d3c6af0e9a7a] | committer: Michael Niedermayer

avcodec/takdec: Fix integer overflow in decorrelate()

Fixes: signed integer overflow: -2424832 - 2145653689 cannot be represented in type 'int'
Fixes: 16138/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TAK_fuzzer-5643451346976768

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=f1192736494a5b16717de66da4a3d3c6af0e9a7a
---

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

diff --git a/libavcodec/takdec.c b/libavcodec/takdec.c
index 0439a3ac9b..4fb5825532 100644
--- a/libavcodec/takdec.c
+++ b/libavcodec/takdec.c
@@ -653,7 +653,7 @@ static int decorrelate(TAKDecContext *s, int c1, int c2, int length)
                          s->residues[i    ] * s->filter[0];
                 }
 
-                v = av_clip_intp2(v >> 10, 13) * (1 << dshift) - *p1;
+                v = av_clip_intp2(v >> 10, 13) * (1U << dshift) - *p1;
                 *p1++ = v;
             }