[FFmpeg-cvslog] avcodec/hevcdsp_template.c: Fix undefined shift in FUNC(dequant)

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Fri Dec 22 03:12:03 2017 +0100| [789157fdde3db893eccb910d1a1d3f8ae1df8293] | committer: Michael Niedermayer

avcodec/hevcdsp_template.c: Fix undefined shift in FUNC(dequant)

Fixes: runtime error: left shift of negative value -180
Fixes: 4626/clusterfuzz-testcase-minimized-5647837887987712

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 0c9ab5ef9c1ee852c80c859c9e07efe8730b57ed)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=789157fdde3db893eccb910d1a1d3f8ae1df8293
---

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

diff --git a/libavcodec/hevcdsp_template.c b/libavcodec/hevcdsp_template.c
index 57d18bd176..4d2e6bf453 100644
--- a/libavcodec/hevcdsp_template.c
+++ b/libavcodec/hevcdsp_template.c
@@ -125,7 +125,7 @@ static void FUNC(transform_skip)(int16_t *_coeffs, int16_t log2_size)
     } else {
         for (y = 0; y < size; y++) {
             for (x = 0; x < size; x++) {
-                *coeffs = *coeffs << -shift;
+                *coeffs = *(uint16_t*)coeffs << -shift;
                 coeffs++;
             }
         }