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>

diff --git a/drivers/staging/cs5535_gpio/cs5535_gpio.c b/drivers/staging/cs5535_gpio/cs5535_gpio.c
index 0cf1e5f..b25f9d1 100644 (file)
--- 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++;
        }