[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20220711090539.031561621@linuxfoundation.org>
Date: Mon, 11 Jul 2022 11:06:52 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Helge Deller <deller@....de>,
Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 5.4 10/38] fbmem: Check virtual screen sizes in fb_set_var()
From: Helge Deller <deller@....de>
commit 6c11df58fd1ac0aefcb3b227f72769272b939e56 upstream.
Verify that the fbdev or drm driver correctly adjusted the virtual
screen sizes. On failure report the failing driver and reject the screen
size change.
Signed-off-by: Helge Deller <deller@....de>
Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: stable@...r.kernel.org # v5.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/video/fbdev/core/fbmem.c | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1014,6 +1014,16 @@ fb_set_var(struct fb_info *info, struct
if (ret)
return ret;
+ /* verify that virtual resolution >= physical resolution */
+ if (var->xres_virtual < var->xres ||
+ var->yres_virtual < var->yres) {
+ pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n",
+ info->fix.id,
+ var->xres_virtual, var->yres_virtual,
+ var->xres, var->yres);
+ return -EINVAL;
+ }
+
if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
return 0;
Powered by blists - more mailing lists