diff options
Diffstat (limited to 'fs/nfs/super.c')
| -rw-r--r-- | fs/nfs/super.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 6eac5bf911e..7f5bc28ea8d 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); |