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fbcon: Disallow setting font bigger than screen size

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commit 65a01e601d upstream.

Prevent that users set a font size which is bigger than the physical screen.
It's unlikely this may happen (because screens are usually much larger than the
fonts and each font char is limited to 32x32 pixels), but it may happen on
smaller screens/LCD displays.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller 2022-06-25 12:56:49 +02:00 committed by Greg Kroah-Hartman
parent b81212828a
commit b727561ddc
1 changed files with 5 additions and 0 deletions
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5
drivers/video/fbdev/core/fbcon.c
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@ -2510,6 +2510,11 @@ static int fbcon_set_font(struct vc_data *vc, struct console_font *font,
if (charcount != 256 && charcount != 512)
return -EINVAL;
/* font bigger than screen resolution ? */
if (w > FBCON_SWAP(info->var.rotate, info->var.xres, info->var.yres) ||
h > FBCON_SWAP(info->var.rotate, info->var.yres, info->var.xres))
return -EINVAL;
/* Make sure drawing engine can handle the font */
if (!(info->pixmap.blit_x & (1 << (font->width - 1))) ||
!(info->pixmap.blit_y & (1 << (font->height - 1))))