NLM: Rewrite IPv4 privileged requester's check

Clean up.

For consistency, rewrite the IPv4 check to match the same style as the
new IPv6 check.  Note that ipv4_is_loopback() is somewhat broader in
its interpretation of what is a loopback address than simply
"127.0.0.1".

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 5 insertions, 2 deletions

diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 80d7e8a8257d..aa6fe7026de7 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -291,8 +291,11 @@ static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
 static inline int __nlm_privileged_request4(const struct sockaddr *sap)
 {
         const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
-        return (sin->sin_addr.s_addr == htonl(INADDR_LOOPBACK)) &&
-                        (ntohs(sin->sin_port) < 1024);
+
+        if (ntohs(sin->sin_port) > 1023)
+                return 0;
+
+        return ipv4_is_loopback(sin->sin_addr.s_addr);
 }
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)