[FFmpeg-cvslog] avcodec/takdec: Fix integer overflow

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Thu Jun 22 21:21:56 2017 +0200| [7fadd9625f71fa05d9885e0cee6bbc579c4753db] | committer: Michael Niedermayer

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 at niedermayer.cc>
(cherry picked from commit 0c2ef4f6b4d52a7b7184c747ffea3576926ea1b1)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7fadd9625f71fa05d9885e0cee6bbc579c4753db
---

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

diff --git a/libavcodec/takdec.c b/libavcodec/takdec.c
index fd4c6483d2..1de23fbcf1 100644
--- a/libavcodec/takdec.c
+++ b/libavcodec/takdec.c
@@ -469,7 +469,7 @@ 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] +