[FFmpeg-cvslog] avcodec/wavpack: Fix runtime error: signed integer overflow: 2147483642 + 512 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed May 10 23:28:21 2017 +0200| [48f7757749564dac8ad68d11fca13d0739aa2304] | committer: Michael Niedermayer

avcodec/wavpack: Fix runtime error: signed integer overflow: 2147483642 + 512 cannot be represented in type 'int'

Fixed: 1453/clusterfuzz-testcase-minimized-5024976874766336

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=48f7757749564dac8ad68d11fca13d0739aa2304
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index d2ba97ee2c..87c065c1e7 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -433,8 +433,8 @@ static inline int wv_unpack_stereo(WavpackFrameContext *s, GetBitContext *gb,
                     L2 = L + ((s->decorr[i].weightA * (int64_t)A + 512) >> 10);
                     R2 = R + ((s->decorr[i].weightB * (int64_t)B + 512) >> 10);
                 } else {
-                    L2 = L + ((s->decorr[i].weightA * A + 512) >> 10);
-                    R2 = R + ((s->decorr[i].weightB * B + 512) >> 10);
+                    L2 = L + ((int)(s->decorr[i].weightA * A + 512U) >> 10);
+                    R2 = R + ((int)(s->decorr[i].weightB * B + 512U) >> 10);
                 }
                 if (A && L)
                     s->decorr[i].weightA -= ((((L ^ A) >> 30) & 2) - 1) * s->decorr[i].delta;