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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 5d852f338d
commit 4841b2759f
1 changed files with 2 additions and 1 deletions
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3
libavcodec/pngdec.c
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@@ -841,10 +841,11 @@ static int decode_frame(AVCodecContext *avctx,
int i, j;
uint8_t *pd = p->data[0];
uint8_t *pd_last = s->last_picture.f->data[0];
int ls = FFMIN(av_image_get_linesize(p->format, s->width, 0), s->width * s->bpp);
ff_thread_await_progress(&s->last_picture, INT_MAX, 0);
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;