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CIFS: Fix oops while mounting with prefixpath

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commit fec11dd9a0109fe52fd631e5c510778d6cbff6cc 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>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Pavel Shilovsky 2011-07-25 17:59:10 +04:00 committed by Al Viro
parent 340a0a01b9
commit 3ca30d40a9
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/dir.c
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@ -641,7 +641,7 @@ lookup_out:
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) {