Patch "fbdev: au1200fb: Fix potential divide by zero" has been added to the 6.2-stable tree

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This is a note to let you know that I've just added the patch titled

    fbdev: au1200fb: Fix potential divide by zero

to the 6.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fbdev-au1200fb-fix-potential-divide-by-zero.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e90bf977ac4685331e7a815c2d05446324434312
Author: Wei Chen <harperchen1110@xxxxxxxxx>
Date:   Wed Mar 15 09:22:54 2023 +0000

    fbdev: au1200fb: Fix potential divide by zero
    
    [ Upstream commit 44a3b36b42acfc433aaaf526191dd12fbb919fdb ]
    
    var->pixclock can be assigned to zero by user. Without
    proper check, divide by zero would occur when invoking
    macro PICOS2KHZ in au1200fb_fb_check_var.
    
    Error out if var->pixclock is zero.
    
    Signed-off-by: Wei Chen <harperchen1110@xxxxxxxxx>
    Signed-off-by: Helge Deller <deller@xxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index 81c3154544287..b6b22fa4a8a01 100644
--- a/drivers/video/fbdev/au1200fb.c
+++ b/drivers/video/fbdev/au1200fb.c
@@ -1040,6 +1040,9 @@ static int au1200fb_fb_check_var(struct fb_var_screeninfo *var,
 	u32 pixclock;
 	int screen_size, plane;
 
+	if (!var->pixclock)
+		return -EINVAL;
+
 	plane = fbdev->plane;
 
 	/* Make sure that the mode respect all LCD controller and



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