diff options
| author | Hangbin Liu <liuhangbin@gmail.com> | 2017-06-11 09:44:20 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-05 14:41:40 +0200 |
| commit | e0cee9f3bfdf3c8e84db231d0247132b4c30bc6e (patch) | |
| tree | 397016b7c037f6e728e5cfbbb59dbd8cb184085e /net | |
| parent | 4d03c6171114ed45d1267cf5d0f49d832de1e917 (diff) | |
xfrm: move xfrm_garbage_collect out of xfrm_policy_flush
commit 138437f591dd9a42d53c6fed1a3c85e02678851c upstream.
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 <liuhangbin@gmail.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/key/af_key.c | 2 | ||||
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 4 | ||||
| -rw-r--r-- | 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 be8cecc65002..eb63a586b555 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 dfc77b9c5e5a..236cbbc0ab9c 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 40a8aa39220d..66698552fbd6 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -1999,6 +1999,7 @@ 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; |