linux-kernel - [PATCH 4.4 12/32] Reset TreeId to zero on SMB2 TREE

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Date:   Mon, 10 Apr 2017 18:39:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan-Marek Glogowski <glogow@...home.de>,
        Aurelien Aptel <aaptel@...e.com>,
        Steve French <smfrench@...il.com>
Subject: [PATCH 4.4 12/32] Reset TreeId to zero on SMB2 TREE_CONNECT

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan-Marek Glogowski <glogow@...home.de>

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@...home.de>
Reviewed-by: Aurelien Aptel <aaptel@...e.com>
Tested-by: Aurelien Aptel <aaptel@...e.com>
Signed-off-by: Steve French <smfrench@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/smb2pdu.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -952,6 +952,10 @@ SMB2_tcon(const unsigned int xid, struct
 		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);