This is a note to let you know that I've just added the patch titled
fbdev: au1200fb: Fix potential divide by zero
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fbdev-au1200fb-fix-potential-divide-by-zero.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 924cf4a5c3ae4a4864717aa07a9a5b4651174b20
Author: Wei Chen <harperchen1110@xxxxxxxxx>
Date: Wed Mar 15 09:22:54 2023 +0000
fbdev: au1200fb: Fix potential divide by zero
[ 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@xxxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index c00e01a173685..a8a0a448cdb5e 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
