Files
twx-linux/include/linux
Helge Deller af93e82197 fbcon: Prevent that screen size is smaller than font size
commit e64242caef 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 16:30:47 +02:00
..
2022-07-07 17:36:49 +02:00
2022-04-15 14:18:32 +02:00
2021-11-17 09:48:17 +01:00
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2021-12-14 14:49:02 +01:00