sctp: do not inherit ipv6_{mc|ac|fl}_list from parent (CVE-2017-9075)

debian/changelog

@@ -414,6 +414,7 @@ linux (4.9.30-1) UNRELEASED; urgency=medium
     (CVE-2017-0605)
   * dccp/tcp: do not inherit mc_list from parent (CVE-2017-8890)
   * ipv6: Prevent overrun when parsing v6 header options (CVE-2017-9074)
+  * sctp: do not inherit ipv6_{mc|ac|fl}_list from parent (CVE-2017-9075)
 
  -- Ben Hutchings <ben@decadent.org.uk>  Mon, 08 May 2017 21:11:08 +0200
 

debian/patches/bugfix/all/sctp-do-not-inherit-ipv6_-mc-ac-fl-_list-from-parent.patch

@@ -0,0 +1,34 @@
+From: Eric Dumazet <edumazet@google.com>
+Date: Wed, 17 May 2017 07:16:40 -0700
+Subject: sctp: do not inherit ipv6_{mc|ac|fl}_list from parent
+Origin: https://git.kernel.org/linus/fdcee2cbb8438702ea1b328fb6e0ac5e9a40c7f8
+Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-9075
+
+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>
+---
+ net/sctp/ipv6.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
+index 142b70e..f5b45b8 100644
+--- a/net/sctp/ipv6.c
++++ b/net/sctp/ipv6.c
+@@ -677,6 +677,9 @@ 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);
+-- 
+2.1.4
+

debian/patches/series

@@ -107,6 +107,7 @@ debian/time-mark-timer_stats-as-broken.patch
 bugfix/all/tracing-Use-strlcpy-instead-of-strcpy-in-__trace_fin.patch
 bugfix/all/dccp-tcp-do-not-inherit-mc_list-from-parent.patch
 bugfix/all/ipv6-prevent-overrun-when-parsing-v6-header-options.patch
+bugfix/all/sctp-do-not-inherit-ipv6_-mc-ac-fl-_list-from-parent.patch
 
 # Fix exported symbol versions
 bugfix/ia64/revert-ia64-move-exports-to-definitions.patch