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

Fixes: 822/clusterfuzz-testcase-4873433189974016
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 943e46a25cae9699c7e55bd220a9fe478df644cc..bc94b27c04071d7a367c839a81d3d495670c77d8 100644 (file)
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -846,7 +846,7 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
                 continue;
             }
             bytestream2_get_buffer(&gb, val, 4);
-            if (val[0] > 32) {
+            if (val[0] > 31) {
                 av_log(avctx, AV_LOG_ERROR,
                        "Invalid INT32INFO, extra_bits = %d (> 32)\n", val[0]);
                 continue;