Reset TreeId to zero on SMB2 TREE_CONNECT

commit 806a28efe9b78ffae5e2757e1ee924b8e50c08ab upstream.

Currently the cifs module breaks the CIFS specs on reconnect as
described in http://msdn.microsoft.com/en-us/library/cc246529.aspx:

"TreeId (4 bytes): Uniquely identifies the tree connect for the
command. This MUST be 0 for the SMB2 TREE_CONNECT Request."

Signed-off-by: Jan-Marek Glogowski <glogow@fbihome.de>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Tested-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 87457227812c..bdd32925a15e 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1104,6 +1104,10 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
                 return -EINVAL;
         }
 
+        /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
+        if (tcon)
+                tcon->tid = 0;
+
         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
         if (rc) {
                 kfree(unc_path);