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fbdev: au1200fb: Fix potential divide by zero

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[ 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@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wei Chen 2023-03-15 09:22:54 +00:00 committed by Greg Kroah-Hartman
parent cba63eac8b
commit fc9e882825
1 changed files with 3 additions and 0 deletions
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3
drivers/video/fbdev/au1200fb.c
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@ -1039,6 +1039,9 @@ 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