[CIFS] fix oops in cifs_lookup during net boot

Fixes bugzilla.kernel.org bug number 14641

Lookup called during network boot (network root filesystem
for diskless workstation) has case where nd is null in
lookup.  This patch fixes that in cifs_lookup.

(Shirish noted that 2.6.30 and 2.6.31 stable need the same check)

Signed-off-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Tested-by:  Vladimir Stavrinov <vs@inist.ru>
CC: Stable <stable@kernel.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 627a60a6c1b1..32771f581b67 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -643,7 +643,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
          * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
          * the VFS handle the create.
          */
-        if (nd->flags & LOOKUP_EXCL) {
+        if (nd && (nd->flags & LOOKUP_EXCL)) {
                 d_instantiate(direntry, NULL);
                 return 0;
         }
@@ -675,7 +675,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
          * reduction in network traffic in the other paths.
          */
         if (pTcon->unix_ext) {
-                if (!(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
+                if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
                      (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
                      (nd->intent.open.flags & O_CREAT)) {
                         rc = cifs_posix_open(full_path, &newInode, nd->path.mnt,