Patch "sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect" has been added to the 3.18-stable tree

[<gregkh@linuxfoundation.org>]

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

    sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect

to the 3.18-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:
     sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch
and it can be found in the queue-3.18 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 Thu Nov 16 15:48:06 CET 2017
From: Xin Long <lucien.xin@gmail.com>
Date: Wed, 18 Oct 2017 21:37:49 +0800
Subject: sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect

From: Xin Long <lucien.xin@gmail.com>


[ Upstream commit 1cc276cec9ec574d41cf47dfc0f51406b6f26ab4 ]

Now sctp processes icmp redirect packet in sctp_icmp_redirect where
it calls sctp_transport_dst_check in which tp->dst can be released.

The problem is before calling sctp_transport_dst_check, it doesn't
check sock_owned_by_user, which means tp->dst could be freed while
a process is accessing it with owning the socket.

An use-after-free issue could be triggered by this.

This patch is to fix it by checking sock_owned_by_user before calling
sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
release tp->dst if users still hold sock lock.

Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
routing redirect race") on sctp also needs this check.

Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/sctp/input.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -420,7 +420,7 @@ void sctp_icmp_redirect(struct sock *sk,
 {
 	struct dst_entry *dst;
 
-	if (!t)
+	if (sock_owned_by_user(sk) || !t)
 		return;
 	dst = sctp_transport_dst_check(t);
 	if (dst)


Patches currently in stable-queue which might be from lucien.xin@gmail.com are

queue-3.18/sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch
queue-3.18/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch