avcodec/takdec: Fix integer overflow

Fixes: runtime error: signed integer overflow: 512 + 2147483146 cannot be represented in type 'int'
Fixes: 2314/clusterfuzz-testcase-minimized-4519333877252096
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/takdec.c b/libavcodec/takdec.c
index 8df73115d81693fbb2e837cc6bac9bec29d785c5..e555482b235deef6159efcb1d43da112b36069a6 100644 (file)
--- a/libavcodec/takdec.c
+++ b/libavcodec/takdec.c
@@ -483,7 +483,7 @@ static int decode_subframe(TAKDecContext *s, int32_t *decoded,
             int v = 1 << (filter_quant - 1);
 
             if (filter_order & -16)
-                v += s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
+                v += (unsigned)s->adsp.scalarproduct_int16(&s->residues[i], s->filter,
                                                  filter_order & -16);
             for (j = filter_order & -16; j < filter_order; j += 4) {
                 v += s->residues[i + j + 3] * s->filter[j + 3] +