[FFmpeg-cvslog] avcodec/aacdec_fixed: fix: left shift of negative value -1

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jul 23 16:52:47 2017 +0200| [a930db5c829919511e15694dd03d1b9ded8a705e] | committer: Michael Niedermayer

avcodec/aacdec_fixed: fix: left shift of negative value -1

Fixes: 2699/clusterfuzz-testcase-minimized-5631303862976512

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 2dfb8c417891e0cc3670f8e0791ea0c7071314fe)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a930db5c829919511e15694dd03d1b9ded8a705e
---

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

diff --git a/libavcodec/aacdec_fixed.c b/libavcodec/aacdec_fixed.c
index 0cac3bf4eb..ccc82057e1 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -430,7 +430,7 @@ static void apply_independent_coupling_fixed(AACContext *ac,
     else {
       for (i = 0; i < len; i++) {
           tmp = (int)(((int64_t)src[i] * c + (int64_t)0x1000000000) >> 37);
-          dest[i] += tmp << shift;
+          dest[i] += tmp * (1 << shift);
       }
     }
 }