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Message-Id: <20230315090518.1037674-1-harperchen1110@gmail.com>
Date:   Wed, 15 Mar 2023 09:05:18 +0000
From:   Wei Chen <harperchen1110@...il.com>
To:     dilinger@...ued.net
Cc:     deller@....de, linux-geode@...ts.infradead.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Wei Chen <harperchen1110@...il.com>
Subject: [PATCH] fbdev: lxfb: Fix potential divide by zero

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@...il.com>
---
 drivers/video/fbdev/geode/lxfb_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/video/fbdev/geode/lxfb_core.c b/drivers/video/fbdev/geode/lxfb_core.c
index 8130e9eee2b4..556d8b1a9e06 100644
--- a/drivers/video/fbdev/geode/lxfb_core.c
+++ b/drivers/video/fbdev/geode/lxfb_core.c
@@ -235,6 +235,9 @@ 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;
 
-- 
2.25.1

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