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avcodec/cdgraphics: limit scrolling to the line

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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@niedermayer.cc>
(cherry picked from commit b7e30a13d4)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-06-09 22:36:00 +02:00
parent 40ed3f6e84
commit ccf14bcbe4
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1 changed files with 1 additions and 1 deletions
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libavcodec/cdgraphics.c
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@ -239,7 +239,7 @@ 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,