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fbdev: lxfb: Fix potential divide by zero

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[ Upstream commit 61ac4b86a4 ]

var->pixclock can be assigned to zero by user. Without proper
check, divide by zero would occur in lx_set_clock.

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 09:05:18 +00:00 • committed by Greg Kroah-Hartman
commit ce5551db36
1 changed files with 3 additions and 0 deletions
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3
drivers/video/fbdev/geode/lxfb_core.c
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@ -234,6 +234,9 @@ static void get_modedb(struct fb_videomode **modedb, unsigned int *size)
static int lxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
if (!var->pixclock)
return -EINVAL;
if (var->xres > 1920 || var->yres > 1440)
return -EINVAL;