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CIFS: Fix oops while mounting with prefixpath

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commit fec11dd9a0 caused
a regression when we have already mounted //server/share/a
and want to mount //server/share/a/b.

The problem is that lookup_one_len calls __lookup_hash
with nd pointer as NULL. Then __lookup_hash calls
do_revalidate in the case when dentry exists and we end
up with NULL pointer deference in cifs_d_revalidate:

if (nd->flags & LOOKUP_RCU)
	return -ECHILD;

Fix this by checking nd for NULL.

Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Shirish Pargaonkar <shirishp@us.ibm.com>
CC: Stable <stable@kernel.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Pavel Shilovsky 2011-07-25 17:59:10 +04:00 committed by Steve French
parent e010a5ef95
commit f5bc1e755d
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/dir.c
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@ -636,7 +636,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
static int
cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd)
{
if (nd->flags & LOOKUP_RCU)
if (nd && (nd->flags & LOOKUP_RCU))
return -ECHILD;
if (direntry->d_inode) {