[PATCH 4.14 027/222] xfrm: policy: use hlist rcu variants on insert

Greg Kroah-Hartman
2018-11-11T22:32:20Z

From: Florian Westphal <fw@strlen.de>

[ Upstream commit 9dffff200fd178f11dd50eb1fd8ccd0650c9284e ]

bydst table/list lookups use rcu, so insertions must use rcu versions.

Fixes: a7c44247f704e ("xfrm: policy: make xfrm_policy_lookup_bytype lockless")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/xfrm/xfrm_policy.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -626,9 +626,9 @@ static void xfrm_hash_rebuild(struct wor
break;
}
if (newpos)
- hlist_add_behind(&policy->bydst, newpos);
+ hlist_add_behind_rcu(&policy->bydst, newpos);
else
- hlist_add_head(&policy->bydst, chain);
+ hlist_add_head_rcu(&policy->bydst, chain);
}

spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
@@ -767,9 +767,9 @@ int xfrm_policy_insert(int dir, struct x
break;
}
if (newpos)
- hlist_add_behind(&policy->bydst, newpos);
+ hlist_add_behind_rcu(&policy->bydst, newpos);
else
- hlist_add_head(&policy->bydst, chain);
+ hlist_add_head_rcu(&policy->bydst, chain);
__xfrm_policy_link(policy, dir);

/* After previous checking, family can either be AF_INET or AF_INET6 */