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

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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: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20251009122955.562888-6-jfalempe@redhat.com
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
This commit is contained in:
Jocelyn Falempe 2025-10-09 14:24:52 +02:00
parent e9b36fe063
commit 2e337dd278
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_panic.c
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@ -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;