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| author | Pavel Shilovsky <piastryyy@gmail.com> | 2011-07-25 15:59:10 +0200 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2011-07-26 00:06:40 +0200 |
| commit | f5bc1e755d23d022bf948904386337fc3e5e29a8 (patch) | |
| tree | 8c65823f6076c2bf25e11f5756abe704deca7708 /fs/cifs/dir.c | |
| parent | [CIFS] Redundant null check after dereference (diff) | |
| download | linux-f5bc1e755d23d022bf948904386337fc3e5e29a8.tar.xz linux-f5bc1e755d23d022bf948904386337fc3e5e29a8.zip | |
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>
Reviewed-by: Shirish Pargaonkar <shirishp@us.ibm.com>
CC: Stable <stable@kernel.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
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 8e9d37d44e9d..c1bd0306d6c6 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -636,7 +636,7 @@ 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) { |