[FFmpeg-cvslog] avcodec/cdgraphics: limit scrolling to the line
Michael Niedermayer
git at videolan.org
Fri Oct 21 23:50:37 EEST 2022
ffmpeg | branch: release/3.2 | Michael Niedermayer <michael at niedermayer.cc> | Thu Jun 9 22:36:00 2022 +0200| [e72660db30804ab75543ba510a8ee45052994480] | committer: Michael Niedermayer
avcodec/cdgraphics: limit scrolling to the line
Fixes: out of array access
Fixes: 47877/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CDGRAPHICS_fuzzer-5690504626438144
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit b7e30a13d4e4557b87f977b76a6bb5e3cbe5ac78)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e72660db30804ab75543ba510a8ee45052994480
---
libavcodec/cdgraphics.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/cdgraphics.c b/libavcodec/cdgraphics.c
index da6fb7af03..3d8219a451 100644
--- a/libavcodec/cdgraphics.c
+++ b/libavcodec/cdgraphics.c
@@ -238,7 +238,7 @@ static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data,
for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++)
memcpy(out + FFMAX(0, hinc) + stride * y,
in + FFMAX(0, hinc) - hinc + (y - vinc) * stride,
- FFMIN(stride + hinc, stride));
+ FFABS(stride) - FFABS(hinc));
if (vinc > 0)
cdg_fill_wrapper(0, 0, out,
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