Helge Deller cecb806c76 fbcon: Prevent that screen size is smaller than font size ... commit e64242caef18b4a5840b0e7a9bff37abd4f4f933 upstream. We need to prevent that users configure a screen size which is smaller than the currently selected font size. Otherwise rendering chars on the screen will access memory outside the graphics memory region. This patch adds a new function fbcon_modechange_possible() which implements this check and which later may be extended with other checks if necessary. The new function is called from the FBIOPUT_VSCREENINFO ioctl handler in fbmem.c, which will return -EINVAL if userspace asked for a too small screen size. Signed-off-by: Helge Deller <deller@gmx.de> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-07-12 16:32:18 +02:00
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backlight	backlight: qcom-wled: Respect enabled-strings in set_brightness	2022-01-27 10:53:59 +01:00
console	parisc/stifb: Fix fb_is_primary_device() only available with CONFIG_FB_STI	2022-06-29 08:59:53 +02:00
fbdev	fbcon: Prevent that screen size is smaller than font size	2022-07-12 16:32:18 +02:00
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display_timing.c
hdmi.c
Kconfig
Makefile
of_display_timing.c
of_videomode.c
vgastate.c
videomode.c