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avcodec/magicyuv: fix small median images

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Fixes: out of array acces
Fixes: 487838419/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MAGICYUV_DEC_fuzzer-4683933221715968

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-03-04 00:22:30 +01:00
parent 1e63151355
commit d5e2e678ab
1 changed files with 2 additions and 1 deletions
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3
libavcodec/magicyuv.c
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@@ -348,7 +348,8 @@ static int magy_decode_slice(AVCodecContext *avctx, void *tdata,
s->llviddsp.add_left_pred(dst, dst, width, 0);
dst += stride;
}
lefttop = left = dst[0];
if (1 + interlaced < height)
lefttop = left = dst[0];
for (k = 1 + interlaced; k < height; k++) {
s->llviddsp.add_median_pred(dst, dst - fake_stride,
dst, width, &left, &lefttop);