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[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>
hifive-unleashed-5.1
Steve French 2009-11-24 22:17:59 +00:00
parent ac50e95078
commit 8e6c0332d5
1 changed files with 2 additions and 2 deletions
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4
fs/cifs/dir.c
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@ -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,