[FFmpeg-cvslog] avcodec/dcadsp: Fix runtime error: signed integer overflow

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Apr  7 22:27:50 2017 +0200| [9244b839b788e4677019041907ff5a4378a23490] | committer: Michael Niedermayer

avcodec/dcadsp: Fix runtime error: signed integer overflow

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9244b839b788e4677019041907ff5a4378a23490
---

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

diff --git a/libavcodec/dcadsp.c b/libavcodec/dcadsp.c
index 4f1e933cfb..fade1a6c02 100644
--- a/libavcodec/dcadsp.c
+++ b/libavcodec/dcadsp.c
@@ -320,7 +320,7 @@ static void dmix_sub_c(int32_t *dst, const int32_t *src, int coeff, ptrdiff_t le
     int i;
 
     for (i = 0; i < len; i++)
-        dst[i] -= mul15(src[i], coeff);
+        dst[i] -= (unsigned)mul15(src[i], coeff);
 }
 
 static void dmix_add_c(int32_t *dst, const int32_t *src, int coeff, ptrdiff_t len)