From: Wei Chen <harperchen1110@gmail.com>
To: dilinger@queued.net
Cc: deller@gmx.de, linux-geode@lists.infradead.org,
linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, Wei Chen <harperchen1110@gmail.com>
Subject: [PATCH] fbdev: lxfb: Fix potential divide by zero
Date: Wed, 15 Mar 2023 09:05:18 +0000 [thread overview]
Message-ID: <20230315090518.1037674-1-harperchen1110@gmail.com> (raw)
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@gmail.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
reply other threads:[~2023-03-15 9:06 UTC|newest]
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