From: Reshetova, Elena Date: Tue, 4 Jul 2017 12:53:22 +0000 (+0300) Subject: net, xfrm: convert xfrm_policy.refcnt from atomic_t to refcount_t X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=850a6212c6fa151076dca045821c75025723bc46;p=openwrt%2Fstaging%2Fblogic.git net, xfrm: convert xfrm_policy.refcnt from atomic_t to refcount_t 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 Signed-off-by: David S. Miller --- diff --git a/include/net/xfrm.h b/include/net/xfrm.h index f5272a275e8f..e1bd1de2d66a 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 edcf1d0f82c8..ca9d3ae665e7 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 4706df612170..ff61d8557929 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);