[FFmpeg-cvslog] avcodec/dfa: Fix off by 1 error

Michael Niedermayer git at videolan.org
Fri May 5 22:06:18 EEST 2017


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri May  5 20:42:11 2017 +0200| [f52fbf4f3ed02a7d872d8a102006f29b4421f360] | committer: Michael Niedermayer

avcodec/dfa: Fix off by 1 error

Fixes out of array access
Fixes: 1345/clusterfuzz-testcase-minimized-6062963045695488

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=f52fbf4f3ed02a7d872d8a102006f29b4421f360
---

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

diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c
index f45d019a79..5ddb647c4c 100644
--- a/libavcodec/dfa.c
+++ b/libavcodec/dfa.c
@@ -175,7 +175,7 @@ static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height
                 return AVERROR_INVALIDDATA;
             frame += v;
         } else {
-            if (frame_end - frame < width + 3)
+            if (frame_end - frame < width + 4)
                 return AVERROR_INVALIDDATA;
             frame[0] = frame[1] =
             frame[width] = frame[width + 1] =  bytestream2_get_byte(gb);



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