[FFmpeg-cvslog] avcodec/cavs: Fix runtime error: signed integer overflow: -12648062 * 256 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Mon Jun  5 19:33:56 2017 +0200| [bcf63142d1596095d3ae72bd8a8807bc77f500b2] | committer: Michael Niedermayer

avcodec/cavs: Fix runtime error: signed integer overflow: -12648062 * 256 cannot be represented in type 'int'

Fixes: 2067/clusterfuzz-testcase-minimized-5578430902960128

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 1e6ee86d9254e8fd2158cc9a31d3be96b0809411)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bcf63142d1596095d3ae72bd8a8807bc77f500b2
---

 libavcodec/cavs.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/libavcodec/cavs.c b/libavcodec/cavs.c
index 8542b124ef..c1b280b344 100644
--- a/libavcodec/cavs.c
+++ b/libavcodec/cavs.c
@@ -537,8 +537,7 @@ void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type)
 static inline void scale_mv(AVSContext *h, int *d_x, int *d_y,
                             cavs_vector *src, int distp)
 {
-    int den = h->scale_den[FFMAX(src->ref, 0)];
-
+    int64_t den = h->scale_den[FFMAX(src->ref, 0)];
     *d_x = (src->x * distp * den + 256 + FF_SIGNBIT(src->x)) >> 9;
     *d_y = (src->y * distp * den + 256 + FF_SIGNBIT(src->y)) >> 9;
 }