[FFmpeg-cvslog] avcodec/takdec: Fix runtime error: left shift of negative value -360

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon May 22 21:43:01 2017 +0200| [0ce7cf0c86a2744ddfe21cb0983ff572ed07ab69] | committer: Michael Niedermayer

avcodec/takdec: Fix runtime error: left shift of negative value -360

Fixes: 1739/clusterfuzz-testcase-minimized-5399237707694080

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=0ce7cf0c86a2744ddfe21cb0983ff572ed07ab69
---

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

diff --git a/libavcodec/takdec.c b/libavcodec/takdec.c
index 081b2f203b..78e82a9d41 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) << dshift) - *p1;
+                v = av_clip_intp2(v >> 10, 13) * (1 << dshift) - *p1;
                 *p1++ = v;
             }