[um] mconsole: don't open-code memdup_user_nul()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 3 insertions, 11 deletions

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 29880c9b324e..b821b13d343a 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -748,19 +748,11 @@ static ssize_t mconsole_proc_write(struct file *file,
 {
         char *buf;
 
-        buf = kmalloc(count + 1, GFP_KERNEL);
-        if (buf == NULL)
-                return -ENOMEM;
-
-        if (copy_from_user(buf, buffer, count)) {
-                count = -EFAULT;
-                goto out;
-        }
-
-        buf[count] = '\0';
+        buf = memdup_user_nul(buffer, count);
+        if (IS_ERR(buf))
+                return PTR_ERR(buf);
 
         mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
- out:
         kfree(buf);
         return count;
 }