[FFmpeg-cvslog] avcodec/aacdec_fixed: Fix runtime error: left shift of negative value -1297616

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jun 11 14:32:35 2017 +0200| [295b24643ecfcdac7ce20d99a50d74d554c73d36] | committer: Michael Niedermayer

avcodec/aacdec_fixed: Fix runtime error: left shift of negative value -1297616

Fixes: 2195/clusterfuzz-testcase-minimized-4736721533009920

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 6d499ecef9c2467772b6066176ffda0b7ab27cc2)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=295b24643ecfcdac7ce20d99a50d74d554c73d36
---

 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 f4503ca137..a72c1e34da 100644
--- a/libavcodec/aacdec_fixed.c
+++ b/libavcodec/aacdec_fixed.c
@@ -388,7 +388,7 @@ static void apply_dependent_coupling_fixed(AACContext *ac,
                         for (k = offsets[i]; k < offsets[i + 1]; k++) {
                             tmp = (int)(((int64_t)src[group * 128 + k] * c + \
                                         (int64_t)0x1000000000) >> 37);
-                            dest[group * 128 + k] += tmp << shift;
+                            dest[group * 128 + k] += tmp * (1 << shift);
                         }
                     }
                 }