Commit 56f04730 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

xfrm: add rcu grace period in xfrm_policy_destroy()

We will soon switch sk->sk_policy[] to RCU protection,
as SYNACK packets are sent while listener socket is not locked.

This patch simply adds RCU grace period before struct xfrm_policy
freeing, and the corresponding rcu_head in struct xfrm_policy.

Signed-off-by: default avatarEric Dumazet <>
Acked-by: default avatarSteffen Klassert <>
Signed-off-by: default avatarDavid S. Miller <>
parent b0a8d1a0
......@@ -548,6 +548,7 @@ struct xfrm_policy {
u16 family;
struct xfrm_sec_ctx *security;
struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
struct rcu_head rcu;
static inline struct net *xp_net(const struct xfrm_policy *xp)
......@@ -303,6 +303,14 @@ struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp)
static void xfrm_policy_destroy_rcu(struct rcu_head *head)
struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu);
/* Destroy xfrm_policy: descendant resources must be released to this moment. */
void xfrm_policy_destroy(struct xfrm_policy *policy)
......@@ -312,8 +320,7 @@ void xfrm_policy_destroy(struct xfrm_policy *policy)
if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer))
call_rcu(&policy->rcu, xfrm_policy_destroy_rcu);
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