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2b09d5d364
linux-next/drivers/video
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Samuel Thibault 2b09d5d364 fbcon: Check font dimension limits 
blit_x and blit_y are u32, so fbcon currently cannot support fonts
larger than 32x32.

The 32x32 case also needs shifting an unsigned int, to properly set bit
31, otherwise we get "UBSAN: shift-out-of-bounds in fbcon_set_font",
as reported on:

http://lore.kernel.org/all/IA1PR07MB98308653E259A6F2CE94A4AFABCE9@IA1PR07MB9830.namprd07.prod.outlook.com
Kernel Branch: 6.2.0-rc5-next-20230124
Kernel config: https://drive.google.com/file/d/1F-LszDAizEEH0ZX0HcSR06v5q8FPl2Uv/view?usp=sharing
Reproducer: https://drive.google.com/file/d/1mP1jcLBY7vWCNM60OMf-ogw-urQRjNrm/view?usp=sharing

Reported-by: Sanan Hasanov <sanan.hasanov@Knights.ucf.edu>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Fixes: 2d2699d984 ("fbcon: font setting should check limitation of driver")
Cc: stable@vger.kernel.org
Tested-by: Miko Larsson <mikoxyzzz@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Helge Deller <deller@gmx.de>
2023-02-04 14:29:19 +01:00
..
backlight - Fix-ups 2022-12-21 09:24:39 -08:00
console fbdev: Move fbdev drivers from strlcpy to strscpy 2022-08-24 22:06:15 +02:00
fbdev fbcon: Check font dimension limits 2023-02-04 14:29:19 +01:00
logo .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
aperture.c fbdev/core: Avoid uninitialized read in aperture_remove_conflicting_pci_device() 2022-10-27 09:20:05 +02:00
display_timing.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
hdmi.c video/hdmi: Add audio_infoframe packing for DP 2022-09-04 15:31:59 +03:00
Kconfig drm: Move nomodeset kernel parameter to drivers/video 2022-11-16 13:26:12 +01:00
Makefile drm: Move nomodeset kernel parameter to drivers/video 2022-11-16 13:26:12 +01:00
nomodeset.c drm: Move nomodeset kernel parameter to drivers/video 2022-11-16 13:26:12 +01:00
of_display_timing.c video: fbdev: of: display_timing: Remove a redundant zeroing of memory 2022-04-04 08:55:23 +02:00
of_videomode.c video: Fix kernel-doc warnings in of_display_timing + of_videomode 2020-11-29 22:42:17 +01:00
vgastate.c Video: vgastate: fixed a spacing coding style 2018-10-08 12:57:35 +02:00
videomode.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00