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avcodec/mmvideo: Bounds check 2nd line of HHV Intra blocks 

Fixes out of array access
Fixes: asan_heap-oob_4da4f3_8_asan_heap-oob_4da4f3_419_scene1a.mm

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 8b0e96e1f2)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-10-03 14:45:04 +02:00
parent b5298c464f
commit ce9d497755
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mmvideo.c
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@ -111,7 +111,7 @@ static int mm_decode_intra(MmContext * s, int half_horiz, int half_vert)
if (color) {
memset(s->frame->data[0] + y*s->frame->linesize[0] + x, color, run_length);
if (half_vert)
if (half_vert && y + half_vert < s->avctx->height)
memset(s->frame->data[0] + (y+1)*s->frame->linesize[0] + x, color, run_length);
}
x+= run_length;