linux-kernel - [PATCH] [53/106] cifs: always do is_path_accessible check in cifs

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Date:	Tue, 26 Apr 2011 14:13:33 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	jlayton@...hat.com, sfrench@...ibm.com, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [53/106] cifs: always do is_path_accessible check in cifs_mount

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Jeff Layton <jlayton@...hat.com>

commit 70945643722ffeac779d2529a348f99567fa5c33 upstream.

Currently, we skip doing the is_path_accessible check in cifs_mount if
there is no prefixpath. I have a report of at least one server however
that allows a TREE_CONNECT to a share that has a DFS referral at its
root. The reporter in this case was using a UNC that had no prefixpath,
so the is_path_accessible check was not triggered and the box later hit
a BUG() because we were chasing a DFS referral on the root dentry for
the mount.

This patch fixes this by removing the check for a zero-length
prefixpath.  That should make the is_path_accessible check be done in
this situation and should allow the client to chase the DFS referral at
mount time instead.

Reported-and-Tested-by: Yogesh Sharma <ysharma@...er.com>
Signed-off-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Steve French <sfrench@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/cifs/connect.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/fs/cifs/connect.c
===================================================================
--- linux-2.6.35.y.orig/fs/cifs/connect.c
+++ linux-2.6.35.y/fs/cifs/connect.c
@@ -2606,7 +2606,7 @@ try_mount_again:

 remote_path_check:
 	/* check if a whole path (including prepath) is not remote */
-	if (!rc && cifs_sb->prepathlen && tcon) {
+	if (!rc && tcon) {
 		/* build_path_to_root works only when we have a valid tcon */
 		full_path = cifs_build_path_to_root(cifs_sb);
 		if (full_path == NULL) {
--
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