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avcodec/webp: Check ref_x/y

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Fixes: 70991/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WEBP_fuzzer-5544067620995072
Fixes: use of uninintailized value

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 7c1e732ad2)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2024-08-16 16:00:01 +02:00
parent 0225aa6255
commit 74daedb049
1 changed files with 3 additions and 0 deletions
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3
libavcodec/webp.c
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@@ -738,6 +738,9 @@ static int decode_entropy_coded_image(WebPContext *s, enum ImageRole role,
ref_x = FFMAX(0, ref_x);
ref_y = FFMAX(0, ref_y);
if (ref_y == y && ref_x >= x)
return AVERROR_INVALIDDATA;
/* copy pixels
* source and dest regions can overlap and wrap lines, so just
* copy per-pixel */