diff options
| author | Steffen Klassert <steffen.klassert@secunet.com> | 2017-02-14 07:43:56 +0100 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-08-20 13:24:44 +0200 |
| commit | c112fe63f337712984a4525f43b43081d3138ff3 (patch) | |
| tree | 814e7a8f3bbb8a5598389125f0ae17cdb8253227 | |
| parent | c8d5029cb6cfffe5030ce044ce0d639431a6bd93 (diff) | |
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 <dvyukov@google.com>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Joe Maples <joe@frap129.org>
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 10c556e37..f099dd085 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1093,14 +1093,13 @@ static inline int policy_to_flow_dir(int dir) } static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, - const struct flowi *fl) + const struct flowi *fl, u16 family) { struct xfrm_policy *pol; read_lock_bh(&xfrm_policy_lock); if ((pol = sk->sk_policy[dir]) != 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) { @@ -2059,7 +2058,7 @@ restart: 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) @@ -2337,7 +2336,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, pol = NULL; 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; |