linux-kernel - [PATCH] fbdev: au1200fb: Fix potential divide by zero

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Date:   Wed, 15 Mar 2023 09:22:54 +0000
From:   Wei Chen <harperchen1110@...il.com>
To:     deller@....de
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Wei Chen <harperchen1110@...il.com>
Subject: [PATCH] fbdev: au1200fb: Fix potential divide by zero

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@...il.com>
---
 drivers/video/fbdev/au1200fb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index 81c315454428..b6b22fa4a8a0 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
-- 
2.25.1