[PATCH 1/5] graphic_utils: Clip to screen boundaries

[Sascha Hauer <s.hauer@pengutronix.de>]

Do not render the parts of the image that are outside the screen
boundaries to prevent memory corruptions.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 lib/gui/graphic_utils.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/gui/graphic_utils.c b/lib/gui/graphic_utils.c
index d91a7f3550..93ef1214f9 100644
--- a/lib/gui/graphic_utils.c
+++ b/lib/gui/graphic_utils.c
@@ -229,6 +229,9 @@ void gu_rgba_blend(struct fb_info *info, struct image *img, void* buf, int heigh
 	line_length = info->line_length;
 
 	for (y = 0; y < height; y++) {
+		if (y + starty >= info->yres)
+			break;
+
 		adr = buf + (y + starty) * line_length +
 				startx * (info->bits_per_pixel >> 3);
 		image = img->data + (y * img->width *img_byte_per_pixel);
@@ -236,6 +239,9 @@ void gu_rgba_blend(struct fb_info *info, struct image *img, void* buf, int heigh
 		for (x = 0; x < width; x++) {
 			uint8_t *pixel = image;
 
+			if (x + startx >= info->xres)
+				break;
+
 			if (is_rgba)
 				gu_set_rgba_pixel(info, adr, pixel[0], pixel[1],
 						pixel[2], pixel[3]);

-- 
2.39.5