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

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

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 50062e70140dcd2c80f88a0be2d1663b0f0c6d86..0940892de84de7bc94cd85a0afae6f246d54a015 100644 (file)
--- 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);