From: Wei Chen <harperchen1110@gmail.com>
Date: Wed, 15 Mar 2023 09:22:54 +0000
Subject: [PATCH] fbdev: au1200fb: Fix potential divide by zero
References: bsc#1012628
Patch-mainline: 6.2.10
Git-commit: 44a3b36b42acfc433aaaf526191dd12fbb919fdb
[ 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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
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 81c31545..b6b22fa4 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
--
2.35.3