Return-Path: Received: from mga07.intel.com ([134.134.136.100]:60885 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752051AbdGDM5l (ORCPT ); Tue, 4 Jul 2017 08:57:41 -0400 From: Elena Reshetova To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, davem@davemloft.net, jmorris@namei.org, kaber@trash.net, yoshfuji@linux-ipv6.org, kuznet@ms2.inr.ac.ru, 3chas3@gmail.com, ralf@linux-mips.org, stephen@networkplumber.org, jchapman@katalix.com, jhs@mojatatu.com, bridge@lists.linux-foundation.org, linux-hams@vger.kernel.org, linux-x25@vger.kernel.org, peterz@infradead.org, keescook@chromium.org, linux-rdma@vger.kernel.org, linux-sctp@vger.kernel.org, vyasevich@gmail.com, nhorman@tuxdriver.com, linux-nfs@vger.kernel.org, zyan@redhat.com, sage@redhat.com, bfields@fieldses.org, jlayton@poochiereds.net, steffen.klassert@secunet.com, herbert@gondor.apana.org.au, santosh.shilimkar@oracle.com, jreuter@yaina.de, Elena Reshetova , Hans Liljestrand , David Windsor Subject: [PATCH 27/36] net, xfrm: convert xfrm_policy.refcnt from atomic_t to refcount_t Date: Tue, 4 Jul 2017 15:53:22 +0300 Message-Id: <1499172811-16271-28-git-send-email-elena.reshetova@intel.com> In-Reply-To: <1499172811-16271-1-git-send-email-elena.reshetova@intel.com> References: <1499172811-16271-1-git-send-email-elena.reshetova@intel.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor --- include/net/xfrm.h | 6 +++--- net/key/af_key.c | 2 +- net/xfrm/xfrm_policy.c | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/net/xfrm.h b/include/net/xfrm.h index f5272a2..e1bd1de 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -560,7 +560,7 @@ struct xfrm_policy { /* This lock only affects elements except for entry. */ rwlock_t lock; - atomic_t refcnt; + refcount_t refcnt; struct timer_list timer; struct flow_cache_object flo; @@ -816,14 +816,14 @@ static inline void xfrm_audit_state_icvfail(struct xfrm_state *x, static inline void xfrm_pol_hold(struct xfrm_policy *policy) { if (likely(policy != NULL)) - atomic_inc(&policy->refcnt); + refcount_inc(&policy->refcnt); } void xfrm_policy_destroy(struct xfrm_policy *policy); static inline void xfrm_pol_put(struct xfrm_policy *policy) { - if (atomic_dec_and_test(&policy->refcnt)) + if (refcount_dec_and_test(&policy->refcnt)) xfrm_policy_destroy(policy); } diff --git a/net/key/af_key.c b/net/key/af_key.c index edcf1d0..ca9d3ae 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -2177,7 +2177,7 @@ static int pfkey_xfrm_policy2msg(struct sk_buff *skb, const struct xfrm_policy * } hdr->sadb_msg_len = size / sizeof(uint64_t); - hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); + hdr->sadb_msg_reserved = refcount_read(&xp->refcnt); return 0; } diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 4706df6..ff61d85 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -62,7 +62,7 @@ static struct xfrm_policy *__xfrm_policy_unlink(struct xfrm_policy *pol, static inline bool xfrm_pol_hold_rcu(struct xfrm_policy *policy) { - return atomic_inc_not_zero(&policy->refcnt); + return refcount_inc_not_zero(&policy->refcnt); } static inline bool @@ -292,7 +292,7 @@ struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) INIT_HLIST_NODE(&policy->bydst); INIT_HLIST_NODE(&policy->byidx); rwlock_init(&policy->lock); - atomic_set(&policy->refcnt, 1); + refcount_set(&policy->refcnt, 1); skb_queue_head_init(&policy->polq.hold_queue); setup_timer(&policy->timer, xfrm_policy_timer, (unsigned long)policy); -- 2.7.4