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cifs: always do is_path_accessible check in cifs_mount

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commit 7094564372 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@cymer.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jeff Layton 2011-03-14 13:48:08 -04:00 committed by Greg Kroah-Hartman
parent b3c054cfaf
commit b6502c562a
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/connect.c
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@ -2532,7 +2532,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
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) {