[FFmpeg-cvslog] avcodec/wmv2dsp: Fix runtime error: signed integer overflow: 181 * -17047030 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri May 12 13:05:46 2017 +0200| [df640dbbc949d0f4deefaf43e86b8bd50ae997cc] | committer: Michael Niedermayer

avcodec/wmv2dsp: Fix runtime error: signed integer overflow: 181 * -17047030 cannot be represented in type 'int'

Fixes: 1503/clusterfuzz-testcase-minimized-5369271855087616

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=df640dbbc949d0f4deefaf43e86b8bd50ae997cc
---

 libavcodec/wmv2dsp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/wmv2dsp.c b/libavcodec/wmv2dsp.c
index 7a3a851861..543f01b852 100644
--- a/libavcodec/wmv2dsp.c
+++ b/libavcodec/wmv2dsp.c
@@ -48,8 +48,8 @@ static void wmv2_idct_row(short * b)
     a4 = W0 * b[0] - W0 * b[4];
 
     /* step 2 */
-    s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7
-    s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;
+    s1 = (int)(181U * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7
+    s2 = (int)(181U * (a1 - a5 - a7 + a3) + 128) >> 8;
 
     /* step 3 */
     b[0] = (a0 + a2 + a1 + a5 + (1 << 7)) >> 8;