From 35c1e95b41e9a626be39629993eb23dae2f80fd7 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 30 Oct 2017 23:21:40 +0100 Subject: [PATCH] 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 (cherry picked from commit e8fafef1db43ead4eae5a6301ccc300e73aa47da) Signed-off-by: Michael Niedermayer --- libavcodec/xan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/xan.c b/libavcodec/xan.c index 662386af9a..85fa8e7394 100644 --- a/libavcodec/xan.c +++ b/libavcodec/xan.c @@ -262,7 +262,7 @@ 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 ; }