linux-kernel - [PATCH 3.12 05/86] Reset TreeId to zero on SMB2 TREE

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Message-Id: <6af96798c54cd0e3843926a6c6303d9e916bebe2.1493888632.git.jslaby@suse.cz>
Date:   Thu,  4 May 2017 11:03:30 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Jan-Marek Glogowski <glogow@...home.de>,
        Steve French <smfrench@...il.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 05/86] Reset TreeId to zero on SMB2 TREE_CONNECT

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

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

===============

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: Jiri Slaby <jslaby@...e.cz>
---
 fs/cifs/smb2pdu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 30d0751626e3..c7a400415d02 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -853,6 +853,10 @@ 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);
-- 
2.12.2