[FFmpeg-cvslog] avcodec/diracdsp: fix integer overflow

[Michael Niedermayer]

ffmpeg | branch: release/3.2 | Michael Niedermayer <michael at niedermayer.cc> | Sat Jul 29 15:55:36 2017 +0200| [19938f1a11355a199135c7411eab5fbf026a4ffb] | committer: Michael Niedermayer

avcodec/diracdsp: fix integer overflow

Fixes: runtime error: signed integer overflow: 11 * 225726413 cannot be represented in type 'int'
Fixes: 2764/clusterfuzz-testcase-minimized-5382561922547712

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 b2d9d7226943d6229a17e31714ce5162bdf88b33)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=19938f1a11355a199135c7411eab5fbf026a4ffb
---

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

diff --git a/libavcodec/diracdsp.c b/libavcodec/diracdsp.c
index cd1209e209..8bc79b788c 100644
--- a/libavcodec/diracdsp.c
+++ b/libavcodec/diracdsp.c
@@ -199,7 +199,7 @@ static void dequant_subband_ ## PX ## _c(uint8_t *src, uint8_t *dst, ptrdiff_t s
         for (i = 0; i < tot_h; i++) {                                                      \
             c = *src_r++;                                                                  \
             sign = FFSIGN(c)*(!!c);                                                        \
-            c = (FFABS(c)*qf + qs) >> 2;                                                   \
+            c = (FFABS(c)*(unsigned)qf + qs) >> 2;                                                   \
             *dst_r++ = c*sign;                                                             \
         }                                                                                  \
         src += tot_h << (sizeof(PX) >> 1);                                                 \