From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 11 Dec 2007 10:05:50 -0500
Subject: [fs] cifs: oops on second mount to same server
Message-id: 1197385560-21991-6-git-send-email-jlayton@redhat.com
O-Subject: [RHEL5.2 PATCH 05/15] BZ#373741: [CIFS] fix oops on second mount to same server when null auth is used
Bugzilla: 373741

When a share is mounted using no username, cifs_mount sets
volume_info.username as a NULL pointer, and the sesInfo userName as an
empty string. The volume_info.username is passed to a couple of other
functions to see if there is an existing unc or tcp connection that can
be used. These functions assume that the username will be a valid
string that can be passed to strncmp. If the pointer is NULL, then the
kernel will oops if there's an existing session to which the string
can be compared.

This patch changes cifs_mount to set volume_info.username to an empty
string in this situation, which prevents the oops and should make it
so that the comparison to other null auth sessions match.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 4f787c3..60dc369 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1879,7 +1879,7 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 
 	if (volume_info.nullauth) {
 		cFYI(1, ("null user"));
-		volume_info.username = NULL;
+		volume_info.username = "";
 	} else if (volume_info.username) {
 		/* BB fixme parse for domain name here */
 		cFYI(1, ("Username: %s", volume_info.username));