cfb_console: fix RLE bitmap drawing code

There seems to be tools producing incorrect 'end of bitmap data'
markers '0100' in a RLE bitmap. Drawing such bitmaps can result
in overwriting memory above the frame buffer. E.g. on MPC5121e
based boards this memory can contain U-Boot environment.

We may not rely on the correct end of bitmap data marker 0001
only, but also have to check whether we are going to draw a
valid frame buffer scan line.

The patch provides a fix by maintaining a pixel counter
which is incremented by the amount of pixels we are going
to draw. If the counter exceeds frame buffer pixels limit
we stop the drawing with the error message.

Reported-by: Michael Weiss <michael.weiss@ifm.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Tested-by: Anatolij Gustschin <agust@denx.de>

drivers/video/cfb_console.c

@@ -882,6 +882,8 @@ static int display_rle8_bitmap (bmp_image_t *img, int xoff, int yoff,
 	struct palette p[256];
 	bmp_color_table_entry_t cte;
 	int green_shift, red_off;
+	int limit = VIDEO_COLS * VIDEO_ROWS;
+	int pixels = 0;
 
 	x = 0;
 	y = __le32_to_cpu(img->header.height) - 1;
@@ -962,6 +964,10 @@ static int display_rle8_bitmap (bmp_image_t *img, int xoff, int yoff,
 				/* unencoded run */
 				cnt = bm[1];
 				runlen = cnt;
+				pixels += cnt;
+				if (pixels > limit)
+					goto error;
+
 				bm += 2;
 				if (y < height) {
 					if (x >= width) {
@@ -970,7 +976,6 @@ static int display_rle8_bitmap (bmp_image_t *img, int xoff, int yoff,
 					}
 					if (x + runlen > width)
 						cnt = width - x;
-
 					draw_bitmap (&fbp, bm, p, cnt, 0);
 					x += runlen;
 				}
@@ -982,9 +987,13 @@ next_run:
 			break;
 		default:
 			/* encoded run */
+			cnt = bm[0];
+			runlen = cnt;
+			pixels += cnt;
+			if (pixels > limit)
+				goto error;
+
 			if (y < height) { /* only draw into visible area */
-				cnt = bm[0];
-				runlen = cnt;
 				if (x >= width) {
 					x += runlen;
 					bm += 2;
@@ -992,7 +1001,6 @@ next_run:
 				}
 				if (x + runlen > width)
 					cnt = width - x;
-
 				draw_bitmap (&fbp, bm, p, cnt, 1);
 				x += runlen;
 			}
@@ -1001,6 +1009,9 @@ next_run:
 		}
 	}
 	return 0;
+error:
+	printf("Error: Too much encoded pixel data, validate your bitmap\n");
+	return -1;
 }
 #endif