Patch "IB/cma: Fix a race condition in iboe_addr_get_sgid()" 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

IB/cma: Fix a race condition in iboe_addr_get_sgid()

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:
ib-cma-fix-a-race-condition-in-iboe_addr_get_sgid.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: Bart Van Assche <[email protected]>
Date: Mon, 19 Dec 2016 18:00:05 +0100
Subject: IB/cma: Fix a race condition in iboe_addr_get_sgid()

From: Bart Van Assche <[email protected]>

commit fba332b079029c2f4f7e84c1c1cd8e3867310c90 upstream.

Code that dereferences the struct net_device ip_ptr member must be protected with an in_dev_get() / in_dev_put() pair. Hence insert calls to these functions.

---
 include/rdma/ib_addr.h |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

@@ -205,10 +205,12 @@ static inline void iboe_addr_get_sgid(st
 
 	dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
 	if (dev) {
-		ip4 = (struct in_device *)dev->ip_ptr;
-		if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address)
+		ip4 = in_dev_get(dev);
+		if (ip4 && ip4->ifa_list && ip4->ifa_list->ifa_address) {
 			ipv6_addr_set_v4mapped(ip4->ifa_list->ifa_address,
 					       (struct in6_addr *)gid);
+			in_dev_put(ip4);
+		}
 		dev_put(dev);
 	}
 }

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

queue-4.9/ib-mad-fix-an-array-index-check.patch queue-4.9/ipoib-avoid-reading-an-uninitialized-member-variable.patch queue-4.9/ib-rxe-fix-a-memory-leak-in-rxe_qp_cleanup.patch queue-4.9/ib-multicast-check-ib_find_pkey-return-value.patch queue-4.9/ib-cma-fix-a-race-condition-in-iboe_addr_get_sgid.patch queue-4.9/iscsi-target-return-error-if-unable-to-add-network-portal.patch