Patch "IB/cma: Fix a race condition in iboe_addr_get_sgid()" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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 4.4-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-4.4 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 fba332b079029c2f4f7e84c1c1cd8e3867310c90 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@sandisk.com>
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 <bart.vanassche@sandisk.com>

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.

Fixes: commit 7b85627b9f02 ("IB/cma: IBoE (RoCE) IP-based GID addressing")
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Moni Shoua <monis@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -197,10 +197,12 @@ 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 bart.vanassche@sandisk.com are

queue-4.4/ib-mad-fix-an-array-index-check.patch
queue-4.4/ipoib-avoid-reading-an-uninitialized-member-variable.patch
queue-4.4/ib-multicast-check-ib_find_pkey-return-value.patch
queue-4.4/ib-cma-fix-a-race-condition-in-iboe_addr_get_sgid.patch