Patch "target: fix race during implicit transition work flushes" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    target: fix race during implicit transition work flushes

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     target-fix-race-during-implicit-transition-work-flushes.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Dec 18 14:12:34 CET 2017
From: Mike Christie <mchristi@redhat.com>
Date: Thu, 2 Mar 2017 04:59:50 -0600
Subject: target: fix race during implicit transition work flushes

From: Mike Christie <mchristi@redhat.com>


[ Upstream commit 760bf578edf8122f2503a3a6a3f4b0de3b6ce0bb ]

This fixes the following races:

1. core_alua_do_transition_tg_pt could have read
tg_pt_gp_alua_access_state and gone into this if chunk:

if (!explicit &&
        atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
           ALUA_ACCESS_STATE_TRANSITION) {

and then core_alua_do_transition_tg_pt_work could update the
state. core_alua_do_transition_tg_pt would then only set
tg_pt_gp_alua_pending_state and the tg_pt_gp_alua_access_state would
not get updated with the second calls state.

2. core_alua_do_transition_tg_pt could be setting
tg_pt_gp_transition_complete while the tg_pt_gp_transition_work
is already completing. core_alua_do_transition_tg_pt then waits on the
completion that will never be called.

To handle these issues, we just call flush_work which will return when
core_alua_do_transition_tg_pt_work has completed so there is no need
to do the complete/wait. And, if core_alua_do_transition_tg_pt_work
was running, instead of trying to sneak in the state change, we just
schedule up another core_alua_do_transition_tg_pt_work call.

Note that this does not handle a possible race where there are multiple
threads call core_alua_do_transition_tg_pt at the same time. I think
we need a mutex in target_tg_pt_gp_alua_access_state_store.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/target/target_core_alua.c |   10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -1073,16 +1073,8 @@ static int core_alua_do_transition_tg_pt
 	/*
 	 * Flush any pending transitions
 	 */
-	if (!explicit && atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
-	    ALUA_ACCESS_STATE_TRANSITION) {
-		/* Just in case */
-		tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
-		tg_pt_gp->tg_pt_gp_transition_complete = &wait;
+	if (!explicit)
 		flush_work(&tg_pt_gp->tg_pt_gp_transition_work);
-		wait_for_completion(&wait);
-		tg_pt_gp->tg_pt_gp_transition_complete = NULL;
-		return 0;
-	}
 
 	/*
 	 * Save the old primary ALUA access state, and set the current state


Patches currently in stable-queue which might be from mchristi@redhat.com are

queue-4.9/target-use-system-workqueue-for-alua-transitions.patch
queue-4.9/target-iscsi-fix-a-race-condition-in-iscsit_add_reject_from_cmd.patch
queue-4.9/target-fix-alua-transition-timeout-handling.patch
queue-4.9/target-fix-race-during-implicit-transition-work-flushes.patch