Patch "Reset TreeId to zero on SMB2 TREE_CONNECT" has been added to the 4.9-stable tree

Patch "Reset TreeId to zero on SMB2 TREE_CONNECT" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Reset TreeId to zero on SMB2 TREE_CONNECT

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     reset-treeid-to-zero-on-smb2-tree_connect.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 806a28efe9b78ffae5e2757e1ee924b8e50c08ab Mon Sep 17 00:00:00 2001
From: Jan-Marek Glogowski <glogow@fbihome.de>
Date: Mon, 20 Feb 2017 12:25:58 +0100
Subject: Reset TreeId to zero on SMB2 TREE_CONNECT

From: Jan-Marek Glogowski <glogow@fbihome.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@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>

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

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1104,6 +1104,10 @@ 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);


Patches currently in stable-queue which might be from glogow@fbihome.de are

queue-4.9/reset-treeid-to-zero-on-smb2-tree_connect.patch