sel_write_validatetrans(): don't open-code memdup_user_nul()

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

1 files changed, 5 insertions, 7 deletions

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 50062e70140d..0940892de84d 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -656,14 +656,12 @@ static ssize_t sel_write_validatetrans(struct file *file,
         if (*ppos != 0)
                 goto out;
 
-        rc = -ENOMEM;
-        req = kzalloc(count + 1, GFP_KERNEL);
-        if (!req)
-                goto out;
-
-        rc = -EFAULT;
-        if (copy_from_user(req, buf, count))
+        req = memdup_user_nul(buf, count);
+        if (IS_ERR(req)) {
+                rc = PTR_ERR(req);
+                req = NULL;
                 goto out;
+        }
 
         rc = -ENOMEM;
         oldcon = kzalloc(count + 1, GFP_KERNEL);