[FFmpeg-cvslog] avcodec/wavpack: Fix runtime error: left shift of negative value -1

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed May 24 19:53:57 2017 +0200| [bce362d36ccfe8f778662bcfd956187c958a39b5] | committer: Michael Niedermayer

avcodec/wavpack: Fix runtime error: left shift of negative value -1

Fixes: 1807/clusterfuzz-testcase-minimized-6258676199325696

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=bce362d36ccfe8f778662bcfd956187c958a39b5
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 74ca2d492c..103a416f28 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -310,7 +310,7 @@ static float wv_get_value_float(WavpackFrameContext *s, uint32_t *crc, int S)
     }
 
     if (S) {
-        S  <<= s->float_shift;
+        S  *= 1 << s->float_shift;
         sign = S < 0;
         if (sign)
             S = -S;