avcodec/pngdec: Calculate MPNG bytewidth more defensively

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit e830902934a29df05c7af65aef2a480b15f572c4)

Conflicts:

	libavcodec/pngdec.c

1 files changed, 2 insertions, 1 deletions

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 2180f66979..b911c32540 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -841,9 +841,10 @@ 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;