diff options
| author | Pavel Shilovsky <piastryyy@gmail.com> | 2011-07-25 17:59:10 +0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-07-25 14:23:21 -0400 |
| commit | 3ca30d40a91fb9b9871e61d5dea2c1a895906a15 (patch) | |
| tree | 2d0af7b870f0c56a4b81938a65276565e8b0ac2b /fs/cifs/dir.c | |
| parent | 340a0a01b9675a16201cc4fc4a210eb5b3bc11ce (diff) | |
CIFS: Fix oops while mounting with prefixpath
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>
Diffstat (limited to 'fs/cifs/dir.c')
| -rw-r--r-- | fs/cifs/dir.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index 14d602f178c..499f27fc857 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -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) { |