Patch "s390/qeth: lock IP table while applying takeover changes" has been added to the 4.9-stable tree

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

s390/qeth: lock IP table while applying takeover changes

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:
s390-qeth-lock-ip-table-while-applying-takeover-changes.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 <[email protected]> know about it.

From: Julian Wiedmann <[email protected]>
Date: Wed, 13 Dec 2017 18:56:31 +0100
Subject: s390/qeth: lock IP table while applying takeover changes

From: Julian Wiedmann <[email protected]>

[ Upstream commit 8a03a3692b100d84785ee7a834e9215e304c9e00 ]

Modifying the flags of an IP addr object needs to be protected against eg. concurrent removal of the same object from the IP table.

---
 drivers/s390/net/qeth_l3_sys.c |    2 ++
 1 file changed, 2 insertions(+)

@@ -397,6 +397,7 @@ static ssize_t qeth_l3_dev_ipato_enable_
 		goto out;
 	card->ipato.enabled = enable;
 
+	spin_lock_bh(&card->ip_lock);
 	hash_for_each(card->ip_htable, i, addr, hnode) {
 		if (addr->type != QETH_IP_TYPE_NORMAL)
 			continue;

@@ -405,6 +406,7 @@ static ssize_t qeth_l3_dev_ipato_enable_
 		else if (qeth_l3_is_addr_covered_by_ipato(card, addr))
 			addr->set_flags |= QETH_IPA_SETIP_TAKEOVER_FLAG;
 	}
+	spin_unlock_bh(&card->ip_lock);
 out:
 	mutex_unlock(&card->conf_mutex);
 	return rc ? rc : count;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/s390-qeth-lock-ip-table-while-applying-takeover-changes.patch queue-4.9/s390-qeth-apply-takeover-changes-when-mode-is-toggled.patch queue-4.9/s390-qeth-update-takeover-ips-after-configuration-change.patch queue-4.9/s390-qeth-don-t-apply-takeover-changes-to-rxip.patch