staging: cs5535_gpio: check put_user() return code

put_user() may fail, if so return -EFAULT. Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
git-mirror · Jan 21, 2011 · 01ebd76 · 01ebd76
1 parent 2f644cc
commit 01ebd76
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/drivers/staging/cs5535_gpio/cs5535_gpio.c b/drivers/staging/cs5535_gpio/cs5535_gpio.c
@@ -146,7 +146,8 @@ static ssize_t cs5535_gpio_read(struct file *file, char __user *buf,
 
 	/* add a line-feed if there is room */
 	if ((i == ARRAY_SIZE(rm)) && (count < len)) {
-		put_user('\n', buf + count);
+		if (put_user('\n', buf + count))
+			return -EFAULT;
 		count++;
 	}