[FFmpeg-cvslog] avcodec/nellymoser: Fix multiple left shift of negative value -8591

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri May  5 19:28:56 2017 +0200| [0953736b7e97f6e121a0587a95434bf1857a27da] | committer: Michael Niedermayer

avcodec/nellymoser: Fix multiple left shift of negative value -8591

Fixes: 1342/clusterfuzz-testcase-minimized-5490842129137664

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0953736b7e97f6e121a0587a95434bf1857a27da
---

 libavcodec/nellymoser.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/nellymoser.c b/libavcodec/nellymoser.c
index 027726e0ba..5ff6583c5e 100644
--- a/libavcodec/nellymoser.c
+++ b/libavcodec/nellymoser.c
@@ -84,7 +84,7 @@ const int16_t ff_nelly_delta_table[32] = {
 
 static inline int signed_shift(int i, int shift) {
     if (shift > 0)
-        return i << shift;
+        return (unsigned)i << shift;
     return i >> -shift;
 }
 
@@ -108,7 +108,7 @@ static int headroom(int *la)
         return 31;
     }
     l = 30 - av_log2(FFABS(*la));
-    *la <<= l;
+    *la *= 1<<l;
     return l;
 }