[FFmpeg-cvslog] avcodec/hevc_filter: Fix invalid shift

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Tue Jun 20 14:38:34 2017 +0200| [fc30465bcb35c38b411af99f10c0d44f6b19302a] | committer: Michael Niedermayer

avcodec/hevc_filter: Fix invalid shift

Fixes: runtime error: left shift of negative value -1

Fixes: 2299/clusterfuzz-testcase-minimized-4843509351710720

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 d7b3d5c3f2e2ff1994762b5e09c05fbc33790b5b)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fc30465bcb35c38b411af99f10c0d44f6b19302a
---

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

diff --git a/libavcodec/hevc_filter.c b/libavcodec/hevc_filter.c
index 1f33b0cdfe..9fbcd1d8b8 100644
--- a/libavcodec/hevc_filter.c
+++ b/libavcodec/hevc_filter.c
@@ -471,7 +471,7 @@ static int get_pcm(HEVCContext *s, int x, int y)
 
 #define TC_CALC(qp, bs)                                                 \
     tctable[av_clip((qp) + DEFAULT_INTRA_TC_OFFSET * ((bs) - 1) +       \
-                    (tc_offset >> 1 << 1),                              \
+                    (tc_offset & -2),                                   \
                     0, MAX_QP + DEFAULT_INTRA_TC_OFFSET)]
 
 static void deblocking_filter_CTB(HEVCContext *s, int x0, int y0)