[FFmpeg-cvslog] avcodec/dfa: Fix signed integer overflow: -2147483648 - 1 cannot be represented in type 'int'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat May  6 16:38:22 2017 +0200| [12936a4585bc293c0f88327d6840f49e8e744b62] | committer: Michael Niedermayer

avcodec/dfa: Fix signed integer overflow: -2147483648 - 1 cannot be represented in type 'int'

Fixes: 1368/clusterfuzz-testcase-minimized-4507293276176384

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=12936a4585bc293c0f88327d6840f49e8e744b62
---

 libavcodec/dfa.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c
index 5ddb647c4c..3ea12f0511 100644
--- a/libavcodec/dfa.c
+++ b/libavcodec/dfa.c
@@ -67,7 +67,8 @@ static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height
     const uint8_t *frame_start = frame;
     const uint8_t *frame_end   = frame + width * height;
     int mask = 0x10000, bitbuf = 0;
-    int v, count, segments;
+    int v, count;
+    unsigned segments;
     unsigned offset;
 
     segments = bytestream2_get_le32(gb);