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Commit 856fb74f authored by Wei Chen's avatar Wei Chen Committed by Greg Kroah-Hartman
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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: default avatarWei Chen <harperchen1110@gmail.com>
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent deef33c0

drivers/video/fbdev/au1200fb.c

+3 −0
Original line number Diff line number Diff line
@@ -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