[v3,0/4] fbcon: Fixes for screen resolution changes

Message

Helge Deller June 25, 2022, 10:06 p.m. UTC

This series fixes possible out-of-bound memory accesses when users trigger
screen resolutions changes with invalid input parameters, e.g. reconfigures
screen which is smaller than the current font size, or if the virtual screen
size is smaller than the physical screen size.

Helge Deller (4):
  fbcon: Disallow setting font bigger than screen size
  fbcon: Add fbcon_modechange_possible() check
  fbmem: Check screen resolution change against font size
  fbmem: Prevent invalid virtual screen sizes

 drivers/video/fbdev/core/fbcon.c | 32 ++++++++++++++++++++++++++++++++
 drivers/video/fbdev/core/fbmem.c | 10 +++++++++-
 include/linux/fbcon.h            |  4 ++++
 3 files changed, 45 insertions(+), 1 deletion(-)

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2.35.3