diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index fb186f7..20c7f8f 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -131,6 +131,7 @@
 
 /* per smb session structure/fields */
 struct ntlmssp_auth {
+	bool sesskey_per_smbsess; /* whether session key is per smb session */
 	__u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
 	__u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
 	unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index acea6c4..5f99b7f 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -428,7 +428,8 @@
 		NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
 	if (ses->server->sign) {
 		flags |= NTLMSSP_NEGOTIATE_SIGN;
-		if (!ses->server->session_estab)
+		if (!ses->server->session_estab ||
+				ses->ntlmssp->sesskey_per_smbsess)
 			flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
 	}
 
@@ -466,7 +467,8 @@
 		NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
 	if (ses->server->sign) {
 		flags |= NTLMSSP_NEGOTIATE_SIGN;
-		if (!ses->server->session_estab)
+		if (!ses->server->session_estab ||
+				ses->ntlmssp->sesskey_per_smbsess)
 			flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
 	}
 
@@ -641,6 +643,8 @@
 		ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 		if (!ses->ntlmssp)
 			return -ENOMEM;
+		ses->ntlmssp->sesskey_per_smbsess = false;
+
 	}
 
 ssetup_ntlmssp_authenticate:
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index f56cf99..3d01076 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -491,6 +491,7 @@
 	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 	if (!ses->ntlmssp)
 		return -ENOMEM;
+	ses->ntlmssp->sesskey_per_smbsess = true;
 
 	/* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 	ses->sectype = RawNTLMSSP;