korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-29 07:04:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

CIFS: Fix oops while mounting with prefixpath

Browse Source 
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>
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/cifs/dir.c
View File

@ -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) {