diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 576679350e..f01df75e48 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -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;