From: Helge Deller Date: Sat, 25 Jun 2022 10:56:49 +0000 (+0200) Subject: fbcon: Disallow setting font bigger than screen size X-Git-Tag: v6.1-rc5~941^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=65a01e601dbba8b7a51a2677811f70f783766682;p=platform%2Fkernel%2Flinux-starfive.git fbcon: Disallow setting font bigger than screen size 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 Reviewed-by: Daniel Vetter Reviewed-by: Geert Uytterhoeven Cc: stable@vger.kernel.org # v4.14+ --- diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index c4e9171..a335325 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -2469,6 +2469,11 @@ 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))))