[PATCH 3.16 136/178] Reset TreeId to zero on SMB2 TREE_CONNECT

From: Ben Hutchings
Date: Sun Jul 16 2017 - 10:39:51 EST


3.16.46-rc1 review patch. If anyone has any objections, please let me know.

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

From: Jan-Marek Glogowski <glogow@xxxxxxxxxx>

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@xxxxxxxxxx>
Reviewed-by: Aurelien Aptel <aaptel@xxxxxxxx>
Tested-by: Aurelien Aptel <aaptel@xxxxxxxx>
Signed-off-by: Steve French <smfrench@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
fs/cifs/smb2pdu.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -857,6 +857,10 @@ 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);