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avcodec/mmvideo: fix palette index

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Fixes: 391935573/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MMVIDEO_fuzzer-4655048979709952
Fixes: out of array access

Reviewed-by: Peter Ross <pross@xvid.org>
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
2025-05-08 15:30:57 +02:00
parent aeea2defe4
commit 43926e026d
1 changed files with 1 additions and 1 deletions
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libavcodec/mmvideo.c
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@ -91,7 +91,7 @@ static void mm_decode_pal(MmContext *s)
int start = bytestream2_get_le16(&s->gb);
int count = bytestream2_get_le16(&s->gb);
for (int i = 0; i < count; i++)
s->palette[start+i] = 0xFFU << 24 | (bytestream2_get_be24(&s->gb) << 2);
s->palette[(start+i)&0xFF] = 0xFFU << 24 | (bytestream2_get_be24(&s->gb) << 2);
}
/**