[FFmpeg-cvslog] avcodec/wavpack: Fix overflow in adding tail

[Michael Niedermayer]

ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jun  8 00:07:04 2018 +0200| [4fa20782174d387c58290d4612c75b51d466868c] | committer: Michael Niedermayer

avcodec/wavpack: Fix overflow in adding tail

Fixes: signed integer overflow: 2146907204 + 26846088 cannot be represented in type 'int'
Fixes: 8105/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WAVPACK_fuzzer-6233036682166272

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 d13379fb79708f550460dd6d698023bf26f968d5)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4fa20782174d387c58290d4612c75b51d466868c
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 22a2c83a30..8306ec020f 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -85,7 +85,7 @@ typedef struct WavpackContext {
 
 #define LEVEL_DECAY(a)  (((a) + 0x80) >> 8)
 
-static av_always_inline int get_tail(GetBitContext *gb, int k)
+static av_always_inline unsigned get_tail(GetBitContext *gb, int k)
 {
     int p, e, res;