fbdev: fbmem: fix memory access if logo is bigger than the screen
There is no clipping on the x or y axis for logos larger that the framebuffer
size. Therefore: a logo bigger than screen size leads to invalid memory access:
[ 1.254664] Backtrace:
[ 1.254728] [<
c02714e0>] (cfb_imageblit) from [<
c026184c>] (fb_show_logo+0x620/0x684)
[ 1.254763] r10:
00000003 r9:
00027fd8 r8:
c6a40000 r7:
c6a36e50 r6:
00000000 r5:
c06b81e4
[ 1.254774] r4:
c6a3e800
[ 1.254810] [<
c026122c>] (fb_show_logo) from [<
c026c1e4>] (fbcon_switch+0x3fc/0x46c)
[ 1.254842] r10:
c6a3e824 r9:
c6a3e800 r8:
00000000 r7:
c6a0c000 r6:
c070b014 r5:
c6a3e800
[ 1.254852] r4:
c6808c00
[ 1.254889] [<
c026bde8>] (fbcon_switch) from [<
c029c8f8>] (redraw_screen+0xf0/0x1e8)
[ 1.254918] r10:
00000000 r9:
00000000 r8:
00000000 r7:
00000000 r6:
c070d5a0 r5:
00000080
[ 1.254928] r4:
c6808c00
[ 1.254961] [<
c029c808>] (redraw_screen) from [<
c029d264>] (do_bind_con_driver+0x194/0x2e4)
[ 1.254991] r9:
00000000 r8:
00000000 r7:
00000014 r6:
c070d5a0 r5:
c070d5a0 r4:
c070d5a0
So prevent displaying a logo bigger than screen size and avoid invalid
memory access.
Signed-off-by: Manfred Schlaegl <manfred.schlaegl@ginzinger.com>
Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>