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avcodec/pngdec: Calculate MPNG bytewidth more defensively

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit e830902934)

Conflicts:

	libavcodec/pngdec.c
This commit is contained in:
Michael Niedermayer 2014-10-03 17:54:21 +02:00
parent 7238c744de
commit 677da72300
1 changed files with 2 additions and 1 deletions
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3
libavcodec/pngdec.c
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@ -650,9 +650,10 @@ static int decode_frame(AVCodecContext *avctx,
int i, j;
uint8_t *pd = s->current_picture->data[0];
uint8_t *pd_last = s->last_picture->data[0];
int ls = FFMIN(av_image_get_linesize(s->current_picture->format, s->width, 0), s->width * s->bpp);
for(j=0; j < s->height; j++) {
for(i=0; i < s->width * s->bpp; i++) {
for(i=0; i < ls; i++) {
pd[i] += pd_last[i];
}
pd += s->image_linesize;