1 files changed, 20 insertions, 4 deletions

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 6eac5bf911e3..7f5bc28ea8d1 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -447,6 +447,23 @@ static void nfs_umount_begin(struct vfsmount *vfsmnt, int flags)
 }
 
 /*
+ * Sanity-check a server address provided by the mount command
+ */
+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;
+        }
+        }
+
+        return 0;
+}
+
+/*
  * Validate the NFS2/NFS3 mount data
  * - fills in the mount root filehandle
  */
@@ -501,7 +518,7 @@ static int nfs_validate_mount_data(struct nfs_mount_data *data,
 #endif /* CONFIG_NFS_V3 */
 
         /* We now require that the mount process passes the remote address */
-        if (data->addr.sin_addr.s_addr == INADDR_ANY) {
+        if (!nfs_verify_server_address((struct sockaddr *) &data->addr)) {
                 dprintk("%s: mount program didn't pass remote address!\n",
                         __FUNCTION__);
                 return -EINVAL;
@@ -819,13 +836,12 @@ static int nfs4_get_sb(struct file_system_type *fs_type,
         if (copy_from_user(&addr, data->host_addr, sizeof(addr)))
                 return -EFAULT;
 
-        if (addr.sin_family != AF_INET ||
-            addr.sin_addr.s_addr == INADDR_ANY
-            ) {
+        if (!nfs_verify_server_address((struct sockaddr *) &addr)) {
                 dprintk("%s: mount program didn't pass remote IP address!\n",
                                 __FUNCTION__);
                 return -EINVAL;
         }
+
         /* RFC3530: The default port for NFS is 2049 */
         if (addr.sin_port == 0)
                 addr.sin_port = htons(NFS_PORT);