[FFmpeg-cvslog] avcodec/wavpack: Fix: runtime error: signed integer overflow: 3 * -2147483648 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed May 24 00:21:20 2017 +0200| [5f91786fc8ad9b4108e09e6cbf119d95c8ac4db7] | committer: Michael Niedermayer

avcodec/wavpack: Fix: runtime error: signed integer overflow: 3 * -2147483648 cannot be represented in type 'int'

Fixes: 1776/clusterfuzz-testcase-minimized-6191258231898112

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5f91786fc8ad9b4108e09e6cbf119d95c8ac4db7
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 103a416f28..20774e61d2 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -542,9 +542,9 @@ static inline int wv_unpack_mono(WavpackFrameContext *s, GetBitContext *gb,
             t = s->decorr[i].value;
             if (t > 8) {
                 if (t & 1)
-                    A =  2 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
+                    A =  2U * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1];
                 else
-                    A = (3 * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
+                    A = (int)(3U * s->decorr[i].samplesA[0] - s->decorr[i].samplesA[1]) >> 1;
                 s->decorr[i].samplesA[1] = s->decorr[i].samplesA[0];
                 j                        = 0;
             } else {