Patch "fou: clean up socket with kfree_rcu" has been added to the 4.3-stable tree

Patch "fou: clean up socket with kfree_rcu" has been added to the 4.3-stable tree

[gregkh]

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

    fou: clean up socket with kfree_rcu

to the 4.3-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:
     fou-clean-up-socket-with-kfree_rcu.patch
and it can be found in the queue-4.3 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 Wed Dec 30 19:48:47 PST 2015
From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Date: Tue, 15 Dec 2015 21:01:53 +0100
Subject: fou: clean up socket with kfree_rcu

From: Hannes Frederic Sowa <hannes@stressinduktion.org>

[ Upstream commit 3036facbb7be3a169e35be3b271162b0fa564a2d ]

fou->udp_offloads is managed by RCU. As it is actually included inside
the fou sockets, we cannot let the memory go out of scope before a grace
period. We either can synchronize_rcu or switch over to kfree_rcu to
manage the sockets. kfree_rcu seems appropriate as it is used by vxlan
and geneve.

Fixes: 23461551c00628c ("fou: Support for foo-over-udp RX path")
Cc: Tom Herbert <tom@herbertland.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/fou.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -24,6 +24,7 @@ struct fou {
 	u16 type;
 	struct udp_offload udp_offloads;
 	struct list_head list;
+	struct rcu_head rcu;
 };
 
 #define FOU_F_REMCSUM_NOPARTIAL BIT(0)
@@ -417,7 +418,7 @@ static void fou_release(struct fou *fou)
 	list_del(&fou->list);
 	udp_tunnel_sock_release(sock);
 
-	kfree(fou);
+	kfree_rcu(fou, rcu);
 }
 
 static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg)


Patches currently in stable-queue which might be from hannes@stressinduktion.org are

queue-4.3/ipv6-automatically-enable-stable-privacy-mode-if-stable_secret-set.patch
queue-4.3/af_unix-revert-lock_interruptible-in-stream-receive-code.patch
queue-4.3/fou-clean-up-socket-with-kfree_rcu.patch
queue-4.3/ipv6-keep-existing-flags-when-setting-ifa_f_optimistic.patch
queue-4.3/net-add-validation-for-the-socket-syscall-protocol-argument.patch