tta: avoid undefined shifts

Signed-off-by: Diego Biurrun <diego@biurrun.de>

diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index 2ac825554ec15e34cc4792c677d3ba5e11527f15..5532580e02239076d086a9078b5f75534db0c633 100644 (file)
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -360,7 +360,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
         }
 
         if (k) {
-            if (k > MIN_CACHE_BITS) {
+            if (k >= 32 || unary > INT32_MAX >> k) {
                 ret = AVERROR_INVALIDDATA;
                 goto error;
             }