[FFmpeg-cvslog] avcodec/dfa: Fix: runtime error: signed integer overflow: -14202 * 196877 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: release/3.0 | Michael Niedermayer <michael at niedermayer.cc> | Thu May 18 01:54:43 2017 +0200| [f2afdab8e40a3a162ba011b026c6331bc73832df] | committer: Michael Niedermayer

avcodec/dfa: Fix: runtime error: signed integer overflow: -14202 * 196877 cannot be represented in type 'int'

Fixes: 1657/clusterfuzz-testcase-minimized-4710000079405056

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 58ac7fb9c395ab91cb321fa4c8c9e127ce8147c3)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f2afdab8e40a3a162ba011b026c6331bc73832df
---

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

diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c
index 3ea12f0511..8067ac94e5 100644
--- a/libavcodec/dfa.c
+++ b/libavcodec/dfa.c
@@ -250,7 +250,7 @@ static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height
         segments = bytestream2_get_le16u(gb);
         while ((segments & 0xC000) == 0xC000) {
             unsigned skip_lines = -(int16_t)segments;
-            unsigned delta = -((int16_t)segments * width);
+            int64_t delta = -((int16_t)segments * (int64_t)width);
             if (frame_end - frame <= delta || y + lines + skip_lines > height)
                 return AVERROR_INVALIDDATA;
             frame    += delta;