[v2,0/4] fbcon: Fixes for screen resolution changes

Message

Helge Deller June 25, 2022, 12:24 p.m. UTC

This series fixes possible out-of-bound memory accesses when users trigger
screen resolutions changes with invalid input parameters, e.g.  configure
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: Fix input parameter checks for user-provided screen resolution
    changes
  fbmem: Catch possible driver bugs regarding too small virtual screen
    size

 drivers/video/fbdev/core/fbcon.c | 31 +++++++++++++++++++++++++++++++
 drivers/video/fbdev/core/fbmem.c | 14 +++++++++++++-
 include/linux/fbcon.h            |  4 ++++
 3 files changed, 48 insertions(+), 1 deletion(-)

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2.35.3