[FFmpeg-cvslog] avcodec/wavpack: Fix runtime error: signed integer overflow: 1886191616 + 277872640 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: release/3.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jun 11 20:19:59 2017 +0200| [34282abc57f4ad66d5b7e0dbed1eadfff41616d8] | committer: Michael Niedermayer

avcodec/wavpack: Fix runtime error: signed integer overflow: 1886191616 + 277872640 cannot be represented in type 'int'

Fixes: 2181/clusterfuzz-testcase-minimized-6314784322486272

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 c996374d4d86e0efbef71812448b4c65656bc667)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=34282abc57f4ad66d5b7e0dbed1eadfff41616d8
---

 libavcodec/wavpack.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/wavpack.h b/libavcodec/wavpack.h
index c949390f51..053b1c575d 100644
--- a/libavcodec/wavpack.h
+++ b/libavcodec/wavpack.h
@@ -94,7 +94,7 @@ typedef struct Decorr {
 typedef struct WvChannel {
     int median[3];
     int slow_level, error_limit;
-    int bitrate_acc, bitrate_delta;
+    unsigned bitrate_acc, bitrate_delta;
 } WvChannel;
 
 // macros for manipulating median values