From: Wei Chen <harperchen1110@gmail.com>
To: deller@gmx.de
Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, Wei Chen <harperchen1110@gmail.com>
Subject: [PATCH] fbdev: au1200fb: Fix potential divide by zero
Date: Wed, 15 Mar 2023 09:22:54 +0000 [thread overview]
Message-ID: <20230315092254.1042615-1-harperchen1110@gmail.com> (raw)
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>
---
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
next reply other threads:[~2023-03-15 9:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-15 9:22 Wei Chen [this message]
2023-03-15 10:25 ` [PATCH] fbdev: au1200fb: Fix potential divide by zero Thomas Zimmermann
2023-03-15 12:27 ` Wei Chen
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