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gifdec: check that w,h is not zero

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Fixes out of array access

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-25 00:03:59 +01:00
parent a0d1440476
commit 286930d302
1 changed files with 2 additions and 0 deletions
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libavcodec/gifdec.c
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@ -187,6 +187,8 @@ static int gif_read_image(GifState *s)
if (left + width > s->screen_width ||
top + height > s->screen_height)
return AVERROR_INVALIDDATA;
if (width <= 0 || height <= 0)
return AVERROR_INVALIDDATA;
/* process disposal method */
if (s->gce_prev_disposal == GCE_DISPOSAL_BACKGROUND) {