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List: linux-fbdev
Subject: [PATCH v3 3/4] fbmem: Check screen resolution change against font size
From: Helge Deller <deller () gmx ! de>
Date: 2022-06-25 22:06:29
Message-ID: 20220625220630.333705-4-deller () gmx ! de
[Download RAW message or body]
Enhance the check in the FBIOPUT_VSCREENINFO ioctl handler to verify if the
user-provided new screen size is bigger than the current font size.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.4+
---
drivers/video/fbdev/core/fbmem.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index afa2863670f3..160389365a36 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1106,7 +1106,9 @@ static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
return -EFAULT;
console_lock();
lock_fb_info(info);
- ret = fb_set_var(info, &var);
+ ret = fbcon_modechange_possible(info, &var);
+ if (!ret)
+ ret = fb_set_var(info, &var);
if (!ret)
fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL);
unlock_fb_info(info);
--
2.35.3
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