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authorPavel Shilovsky <piastryyy@gmail.com>2011-07-25 17:59:10 +0400
committerSteve French <sfrench@us.ibm.com>2011-07-25 22:06:40 +0000
commitf5bc1e755d23d022bf948904386337fc3e5e29a8 (patch)
tree8c65823f6076c2bf25e11f5756abe704deca7708
parente010a5ef95b8b6a12b74b548578f7dcf93564347 (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> Reviewed-by: Shirish Pargaonkar <shirishp@us.ibm.com> CC: Stable <stable@kernel.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r--fs/cifs/dir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 8e9d37d44e9..c1bd0306d6c 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) {