[FFmpeg-cvslog] avcodec/xan: Improve overlapping check
Michael Niedermayer
git at videolan.org
Wed Nov 1 23:11:43 EET 2017
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Oct 30 23:21:40 2017 +0100| [e8fafef1db43ead4eae5a6301ccc300e73aa47da] | committer: Michael Niedermayer
avcodec/xan: Improve overlapping check
Fixes: memcpy-param-overlap
Fixes: 3612/clusterfuzz-testcase-minimized-6393461273001984
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e8fafef1db43ead4eae5a6301ccc300e73aa47da
---
libavcodec/xan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/xan.c b/libavcodec/xan.c
index 4c01c0013f..8b4ec82405 100644
--- a/libavcodec/xan.c
+++ b/libavcodec/xan.c
@@ -263,7 +263,7 @@ static inline void xan_wc3_copy_pixel_run(XanContext *s, AVFrame *frame,
prevframe_index = (y + motion_y) * stride + x + motion_x;
prevframe_x = x + motion_x;
- if (prev_palette_plane == palette_plane && FFABS(curframe_index - prevframe_index) < pixel_count) {
+ if (prev_palette_plane == palette_plane && FFABS(motion_x + width*motion_y) < pixel_count) {
avpriv_request_sample(s->avctx, "Overlapping copy");
return ;
}
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