Commit db6077fd authored by Nicholas Bellinger's avatar Nicholas Bellinger
Browse files

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: default avatarHannes Reinecke <hare@suse.de>
Cc: <stable@vger.kernel.org> #3.12+
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 63832aab
......@@ -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);
......
......@@ -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;
......
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