iscsi-target: Fix incorrect np->np_thread NULL assignment

When shutting down a target there is a race condition between
iscsit_del_np() and __iscsi_target_login_thread().
The latter sets the thread pointer to NULL, and the former
tries to issue kthread_stop() on that pointer without any
synchronization.

This patch moves the np->np_thread NULL assignment into
iscsit_del_np(), after kthread_stop() has completed. It also
removes the signal_pending() + np_state check, and only
exits when kthread_should_stop() is true.

Reported-by: Hannes Reinecke <hare@suse.de>
Cc: <stable@vger.kernel.org> #3.12+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 02182ab..0086719 100644 (file)
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -465,6 +465,7 @@ int iscsit_del_np(struct iscsi_np *np)
                 */
                send_sig(SIGINT, np->np_thread, 1);
                kthread_stop(np->np_thread);
+               np->np_thread = NULL;
        }
 
        np->np_transport->iscsit_free_np(np);

diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 4eb93b2..e29279e 100644 (file)
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -1403,11 +1403,6 @@ old_sess_out:
 
 out:
        stop = kthread_should_stop();
-       if (!stop && signal_pending(current)) {
-               spin_lock_bh(&np->np_thread_lock);
-               stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
-               spin_unlock_bh(&np->np_thread_lock);
-       }
        /* Wait for another socket.. */
        if (!stop)
                return 1;
@@ -1415,7 +1410,6 @@ exit:
        iscsi_stop_login_thread_timer(np);
        spin_lock_bh(&np->np_thread_lock);
        np->np_thread_state = ISCSI_NP_THREAD_EXIT;
-       np->np_thread = NULL;
        spin_unlock_bh(&np->np_thread_lock);
 
        return 0;