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Check for invalid update parameters in vmd video decoder. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Laurent Aimar 2011-09-24 23:16:18 +02:00 committed by Michael Niedermayer
parent 00cbe9e405
commit e7aed1280e
1 changed files with 10 additions and 0 deletions
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10
libavcodec/vmdav.c
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@ -204,6 +204,16 @@ static void vmd_decode(VmdVideoContext *s)
frame_y = AV_RL16(&s->buf[8]);
frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
if (frame_x < 0 || frame_width < 0 ||
frame_x >= s->avctx->width ||
frame_width > s->avctx->width ||
frame_x + frame_width > s->avctx->width)
return;
if (frame_y < 0 || frame_height < 0 ||
frame_y >= s->avctx->height ||
frame_height > s->avctx->height ||
frame_y + frame_height > s->avctx->height)
return;
if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
(frame_x || frame_y)) {