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

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@niedermayer.cc>

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index b216eb068352c06d5cf75a4047c5f6c1c9b33225..25c8e94ca2971896a967896006c5b2f2e34ebbe4 100644 (file)
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -188,7 +188,7 @@ 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));
             }