Patch "cifs: Fix autonegotiate security settings mismatch" has been added to the 4.4-stable tree

Patch "cifs: Fix autonegotiate security settings mismatch" has been added to the 4.4-stable tree

[gregkh]

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

    cifs: Fix autonegotiate security settings mismatch

to the 4.4-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:
     cifs-fix-autonegotiate-security-settings-mismatch.patch
and it can be found in the queue-4.4 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 9aca7e454415f7878b28524e76bebe1170911a88 Mon Sep 17 00:00:00 2001
From: Daniel N Pettersson <danielnp@axis.com>
Date: Thu, 11 Jan 2018 16:00:12 +0100
Subject: cifs: Fix autonegotiate security settings mismatch

From: Daniel N Pettersson <danielnp@axis.com>

commit 9aca7e454415f7878b28524e76bebe1170911a88 upstream.

Autonegotiation gives a security settings mismatch error if the SMB
server selects an SMBv3 dialect that isn't SMB3.02. The exact error is
"protocol revalidation - security settings mismatch".
This can be tested using Samba v4.2 or by setting the global Samba
setting max protocol = SMB3_00.

The check that fails in smb3_validate_negotiate is the dialect
verification of the negotiate info response. This is because it tries
to verify against the protocol_id in the global smbdefault_values. The
protocol_id in smbdefault_values is SMB3.02.
In SMB2_negotiate the protocol_id in smbdefault_values isn't updated,
it is global so it probably shouldn't be, but server->dialect is.

This patch changes the check in smb3_validate_negotiate to use
server->dialect instead of server->vals->protocol_id. The patch works
with autonegotiate and when using a specific version in the vers mount
option.

Signed-off-by: Daniel N Pettersson <danielnp@axis.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/smb2pdu.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -580,8 +580,7 @@ int smb3_validate_negotiate(const unsign
 	}
 
 	/* check validate negotiate info response matches what we got earlier */
-	if (pneg_rsp->Dialect !=
-			cpu_to_le16(tcon->ses->server->vals->protocol_id))
+	if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 		goto vneg_out;
 
 	if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))


Patches currently in stable-queue which might be from danielnp@axis.com are

queue-4.4/cifs-fix-autonegotiate-security-settings-mismatch.patch