linux-kernel - [PATCH 4.18 018/158] cifs: connect to servername instead of IP for IPC$ share

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Message-Id: <20180917211711.645323138@linuxfoundation.org>
Date:   Tue, 18 Sep 2018 00:40:48 +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,
        Thomas Werschlein <thomas.werschlein@....uzh.ch>,
        Steve French <stfrench@...rosoft.com>,
        Tom Talpey <ttalpey@...rosoft.com>,
        Aurelien Aptel <aaptel@...e.com>
Subject: [PATCH 4.18 018/158] cifs: connect to servername instead of IP for IPC$ share

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

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

From: Thomas Werschlein <thomas.werschlein@....uzh.ch>

commit 395a2076b4064f97d3fce03af15210ff2a7bb7f9 upstream.

This patch is required allows access to a Microsoft fileserver failover
cluster behind a 1:1 NAT firewall.

The change also provides stronger context for authentication and share
connection (see MS-SMB2 3.3.5.7 and MS-SRVS 3.1.6.8) as noted by
Tom Talpey, and addresses comments about the buffer size for the UNC
made by Aurélien Aptel.

Signed-off-by: Thomas Werschlein <thomas.werschlein@....uzh.ch>
Signed-off-by: Steve French <stfrench@...rosoft.com>
CC: Tom Talpey <ttalpey@...rosoft.com>
Reviewed-by: Aurelien Aptel <aaptel@...e.com>
CC: Stable <stable@...r.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/cifs/connect.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2523,7 +2523,7 @@ cifs_setup_ipc(struct cifs_ses *ses, str
 	if (tcon == NULL)
 		return -ENOMEM;
 
-	snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->serverName);
+	snprintf(unc, sizeof(unc), "\\\\%s\\IPC$", ses->server->hostname);
 
 	/* cannot fail */
 	nls_codepage = load_nls_default();