NFS: Verify IPv6 addresses properly

Add support to nfs_verify_server_address for recognizing AF_INET6
addresses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index c3d8fcf38523..038b20b38b22 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -600,16 +600,21 @@ static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
 }
 
 /*
- * Sanity-check a server address provided by the mount command
+ * Sanity-check a server address provided by the mount command.
+ *
+ * Address family must be initialized, and address must not be
+ * the ANY address for that family.
  */
 static int nfs_verify_server_address(struct sockaddr *addr)
 {
         switch (addr->sa_family) {
         case AF_INET: {
-                struct sockaddr_in *sa = (struct sockaddr_in *) addr;
-                if (sa->sin_addr.s_addr != INADDR_ANY)
-                        return 1;
-                break;
+                struct sockaddr_in *sa = (struct sockaddr_in *)addr;
+                return sa->sin_addr.s_addr != INADDR_ANY;
+        }
+        case AF_INET6: {
+                struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr;
+                return !ipv6_addr_any(sa);
         }
         }