[FFmpeg-cvslog] avcodec/cfhd: Fix undefined shift

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Wed Jun 21 17:56:34 2017 +0200| [46842f6de995cd3b530f2112b72e197300b1ed25] | committer: Michael Niedermayer

avcodec/cfhd: Fix undefined shift

Fixes: runtime error: left shift of negative value -1
Fixes: 2303/clusterfuzz-testcase-minimized-5529675273076736

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 5a950f4e32a9756391f81987246d96b6549dd447)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=46842f6de995cd3b530f2112b72e197300b1ed25
---

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

diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
index 9473473f2d..c7bc54617d 100644
--- a/libavcodec/cfhd.c
+++ b/libavcodec/cfhd.c
@@ -710,7 +710,7 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
         output = s->plane[plane].subband[0];
         for (i = 0; i < lowpass_height * 2; i++) {
             for (j = 0; j < lowpass_width * 2; j++)
-                output[j] <<= 2;
+                output[j] *= 4;
 
             output += lowpass_width * 2;
         }