[FFmpeg-cvslog] avcodec/wavpack: Fix runtime error: shift exponent 32 is too large for 32-bit type 'int'

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Thu Jun  1 18:48:37 2017 +0200| [3ecefcabe076578b8e31217043af578cfac0a682] | committer: Michael Niedermayer

avcodec/wavpack: Fix runtime error: shift exponent 32 is too large for 32-bit type 'int'

Fixes: 1967/clusterfuzz-testcase-minimized-5757031199801344

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 8b3e580b7f436206e84dac89415e057fa9abdab8)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3ecefcabe076578b8e31217043af578cfac0a682
---

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

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 9ce074d975..e55cd82595 100644
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -184,7 +184,7 @@ static int wv_get_value(WavpackFrameContext *ctx, GetBitContext *gb,
                     goto error;
                 t += t2;
             } else {
-                if (get_bits_left(gb) < t2 - 1)
+                if (t2 >= 32 || get_bits_left(gb) < t2 - 1)
                     goto error;
                 t += get_bits_long(gb, t2 - 1) | (1 << (t2 - 1));
             }