From 138437f591dd9a42d53c6fed1a3c85e02678851c Mon Sep 17 00:00:00 2001 From: Hangbin Liu Date: Sun, 11 Jun 2017 09:44:20 +0800 Subject: [PATCH] xfrm: move xfrm_garbage_collect out of xfrm_policy_flush Now we will force to do garbage collection if any policy removed in xfrm_policy_flush(). But during xfrm_net_exit(). We call flow_cache_fini() first and set set fc->percpu to NULL. Then after we call xfrm_policy_fini() -> frxm_policy_flush() -> flow_cache_flush(), we will get NULL pointer dereference when check percpu_empty. The code path looks like: flow_cache_fini() - fc->percpu = NULL xfrm_policy_fini() - xfrm_policy_flush() - xfrm_garbage_collect() - flow_cache_flush() - flow_cache_percpu_empty() - fcp = per_cpu_ptr(fc->percpu, cpu) To reproduce, just add ipsec in netns and then remove the netns. v2: As Xin Long suggested, since only two other places need to call it. move xfrm_garbage_collect() outside xfrm_policy_flush(). v3: Fix subject mismatch after v2 fix. Fixes: 35db06912189 ("xfrm: do the garbage collection after flushing policy") Signed-off-by: Hangbin Liu Reviewed-by: Xin Long Signed-off-by: Steffen Klassert --- net/key/af_key.c | 2 ++ net/xfrm/xfrm_policy.c | 4 ---- net/xfrm/xfrm_user.c | 1 + 3 files changed, 3 insertions(+), 4 deletions(-) diff --git a/net/key/af_key.c b/net/key/af_key.c index 512dc43d0ce6..5103f92e2eb0 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -2755,6 +2755,8 @@ static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, const struct sad int err, err2; err = xfrm_policy_flush(net, XFRM_POLICY_TYPE_MAIN, true); + if (!err) + xfrm_garbage_collect(net); err2 = unicast_flush_resp(sk, hdr); if (err || err2) { if (err == -ESRCH) /* empty table - old silent behavior */ diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index ed4e52d95172..643a18f72032 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1006,10 +1006,6 @@ int xfrm_policy_flush(struct net *net, u8 type, bool task_valid) err = -ESRCH; out: spin_unlock_bh(&net->xfrm.xfrm_policy_lock); - - if (cnt) - xfrm_garbage_collect(net); - return err; } EXPORT_SYMBOL(xfrm_policy_flush); diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 38614df33ec8..86116e9aaf3d 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -2027,6 +2027,7 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, return 0; return err; } + xfrm_garbage_collect(net); c.data.type = type; c.event = nlh->nlmsg_type; -- 2.20.1