From: Eric Dumazet <edumazet@google.com>
Date: Wed, 17 May 2017 14:16:40 +0000 (-0700)
Subject: sctp: do not inherit ipv6_{mc|ac|fl}_list from parent
X-Git-Tag: archive/raspbian/4.9.30-2+deb9u2+rpi1~8^2~37
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=3632ab6e46b1c1023c35b6b670f6b907da97d9d6;p=linux-4.9.git

sctp: do not inherit ipv6_{mc|ac|fl}_list from parent

SCTP needs fixes similar to 83eaddab4378 ("ipv6/dccp: do not inherit
ipv6_mc_list from parent"), otherwise bad things can happen.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name sctp-do-not-inherit-ipv6_-mc-ac-fl-_list-from-parent.patch
---

diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 6a2532dd31c4..5c4fd79a6e53 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -666,6 +666,9 @@ static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
 	newnp = inet6_sk(newsk);
 
 	memcpy(newnp, np, sizeof(struct ipv6_pinfo));
+	newnp->ipv6_mc_list = NULL;
+	newnp->ipv6_ac_list = NULL;
+	newnp->ipv6_fl_list = NULL;
 
 	rcu_read_lock();
 	opt = rcu_dereference(np->opt);