Commit 2e337dd2 authored by Jocelyn Falempe's avatar Jocelyn Falempe
Browse files

drm/panic: Fix divide by 0 if the screen width < font width 



In the unlikely case that the screen is tiny, and smaller than the
font width, it leads to a divide by 0:

draw_line_with_wrap()
chars_per_row = sb->width / font->width = 0
line_wrap.len = line->len % chars_per_row;

This will trigger a divide by 0

Reviewed-by: default avatarJavier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20251009122955.562888-6-jfalempe@redhat.com


Signed-off-by: default avatarJocelyn Falempe <jfalempe@redhat.com>
parent e9b36fe0

drivers/gpu/drm/drm_panic.c

+1 −1
Original line number Diff line number Diff line
@@ -523,7 +523,7 @@ static void draw_panic_static_kmsg(struct drm_scanout_buffer *sb) 
	struct drm_panic_line line;

	int yoffset;



	if (!font)

	if (!font || font->width > sb->width)

		return;



	yoffset = sb->height - font->height - (sb->height % font->height) / 2;