[linux-cifs-client] [PATCH] [CIFS] only use krb5 session key from first SMB session on socket

[Jeff Layton]

Currently, any new kerberos SMB session overwrites the server's session
key. The session key should only be set by the first SMB session set up
on the socket.

Signed-off-by: Jeff Layton <jlayton at redhat.com>
---
 fs/cifs/sess.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 74ecbc1..d2153ab 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -528,9 +528,11 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 			rc = -EOVERFLOW;
 			goto ssetup_exit;
 		}
-		ses->server->mac_signing_key.len = msg->sesskey_len;
-		memcpy(ses->server->mac_signing_key.data.krb5, msg->data,
-			msg->sesskey_len);
+		if (first_time) {
+			ses->server->mac_signing_key.len = msg->sesskey_len;
+			memcpy(ses->server->mac_signing_key.data.krb5,
+				msg->data, msg->sesskey_len);
+		}
 		pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
 		capabilities |= CAP_EXTENDED_SECURITY;
 		pSMB->req.Capabilities = cpu_to_le32(capabilities);
-- 
1.5.3.6