[FFmpeg-cvslog] avcodec/wavpack: Fix invalid shift

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Tue Jun 27 13:47:32 2017 +0200| [be1f146a0f1c1d30d6ec09b93c29615dae7caff6] | committer: Michael Niedermayer

avcodec/wavpack: Fix invalid shift

Fixes: runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
Fixes: 2377/clusterfuzz-testcase-minimized-6108505935183872

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 c07af720984acaafaa273369080b458d73975775)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=be1f146a0f1c1d30d6ec09b93c29615dae7caff6
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 70625548eb..0429adcfe1 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -837,9 +837,9 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
                 continue;
             }
             bytestream2_get_buffer(&gb, val, 4);
-            if (val[0] > 31) {
+            if (val[0] > 30) {
                 av_log(avctx, AV_LOG_ERROR,
-                       "Invalid INT32INFO, extra_bits = %d (> 32)\n", val[0]);
+                       "Invalid INT32INFO, extra_bits = %d (> 30)\n", val[0]);
                 continue;
             } else if (val[0]) {
                 s->extra_bits = val[0];