linux-kernel - [PATCH 3.16 098/346] iscsi-target: Fix panic when adding second TCP connection to iSCSI session

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Message-ID: <lsq.1479082460.648988466@decadent.org.uk>
Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Feng Li" <lifeng1519@...il.com>,
        "Sumit Rai" <sumit.rai@...softinc.com>,
        "Nicholas Bellinger" <nab@...ux-iscsi.org>
Subject: [PATCH 3.16 098/346] iscsi-target: Fix panic when adding second
 TCP connection to iSCSI session

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

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

From: Feng Li <lifeng1519@...il.com>

commit 8abc718de6e9e52d8a6bfdb735060554aeae25e4 upstream.

In MC/S scenario, the conn->sess has been set NULL in
iscsi_login_non_zero_tsih_s1 when the second connection comes here,
then kernel panic.

The conn->sess will be assigned in iscsi_login_non_zero_tsih_s2. So
we should check whether it's NULL before calling.

Signed-off-by: Feng Li <lifeng1519@...il.com>
Tested-by: Sumit Rai <sumit.rai@...softinc.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/target/iscsi/iscsi_target_login.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -1418,8 +1418,9 @@ static int __iscsi_target_login_thread(s
 	}
 	login->zero_tsih = zero_tsih;
 
-	conn->sess->se_sess->sup_prot_ops =
-		conn->conn_transport->iscsit_get_sup_prot_ops(conn);
+	if (conn->sess)
+		conn->sess->se_sess->sup_prot_ops =
+			conn->conn_transport->iscsit_get_sup_prot_ops(conn);
 
 	tpg = conn->tpg;
 	if (!tpg) {