From 4c86d77743a54fb2d8a4d18a037a074c892bb3be Mon Sep 17 00:00:00 2001 From: Steffen Klassert Date: Tue, 14 Feb 2017 07:43:56 +0100 Subject: [PATCH] xfrm: Don't use sk_family for socket policy lookups On IPv4-mapped IPv6 addresses sk_family is AF_INET6, but the flow informations are created based on AF_INET. So the routing set up 'struct flowi4' but we try to access 'struct flowi6' what leads to an out of bounds access. Fix this by using the family we get with the dst_entry, like we do it for the standard policy lookup. Reported-by: Dmitry Vyukov Tested-by: Dmitry Vyukov Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_policy.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 3c8f5b70abf874..a9af17f0fce669 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1248,7 +1248,7 @@ static inline int policy_to_flow_dir(int dir) } static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir, - const struct flowi *fl) + const struct flowi *fl, u16 family) { struct xfrm_policy *pol; @@ -1256,8 +1256,7 @@ static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir, again: pol = rcu_dereference(sk->sk_policy[dir]); if (pol != NULL) { - bool match = xfrm_selector_match(&pol->selector, fl, - sk->sk_family); + bool match = xfrm_selector_match(&pol->selector, fl, family); int err = 0; if (match) { @@ -2253,7 +2252,7 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig, sk = sk_const_to_full_sk(sk); if (sk && sk->sk_policy[XFRM_POLICY_OUT]) { num_pols = 1; - pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl); + pols[0] = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, family); err = xfrm_expand_policies(fl, family, pols, &num_pols, &num_xfrms); if (err < 0) @@ -2532,7 +2531,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, pol = NULL; sk = sk_to_full_sk(sk); if (sk && sk->sk_policy[dir]) { - pol = xfrm_sk_policy_lookup(sk, dir, &fl); + pol = xfrm_sk_policy_lookup(sk, dir, &fl, family); if (IS_ERR(pol)) { XFRM_INC_STATS(net, LINUX_MIB_XFRMINPOLERROR); return 0;