netdev - Re: [PATCH ipsec-next 6/8] xfrm: policy: only use rcu in xfrm_sk_policy

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Date:   Wed, 16 Nov 2016 18:30:28 +0100
From:   Florian Westphal <fw@...len.de>
To:     Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:     Florian Westphal <fw@...len.de>, netdev@...r.kernel.org,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [PATCH ipsec-next 6/8] xfrm: policy: only use rcu in
 xfrm_sk_policy_lookup

Nicolas Dichtel <nicolas.dichtel@...nd.com> wrote:
> Le 11/08/2016 à 15:17, Florian Westphal a écrit :
> > Don't acquire the readlock anymore and rely on rcu alone.
> > 
> > In case writer on other CPU changed policy at the wrong moment (after we
> > obtained sk policy pointer but before we could obtain the reference)
> > just repeat the lookup.
> > 
> > Signed-off-by: Florian Westphal <fw@...len.de>
> Since this patch, our IKEv1 Transport tests (using charon) fail to establish the
> connection. If I revert it, the IKE negociation is ok again.
> charon logs are enclosed.
> 
> I didn't had time to investigate now, but any idea is welcomed ;-)

I'm an idiot.  Thanks for figuring out the faulty commit!

This should fix it (if we succeed grabbing the refcount, then if (err && !xfrm_pol_hold_rcu
evaluates to false and we hit last else branch and set pol to ERR_PTR(0)...

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index fd6986634e6f..5bf7e1bfeac7 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1268,12 +1268,14 @@ static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
                        err = security_xfrm_policy_lookup(pol->security,
                                                      fl->flowi_secid,
                                                      policy_to_flow_dir(dir));
-                       if (!err && !xfrm_pol_hold_rcu(pol))
-                               goto again;
-                       else if (err == -ESRCH)
+                       if (!err) {
+                               if (!xfrm_pol_hold_rcu(pol))
+                                       goto again;
+                       } else if (err == -ESRCH) {
                                pol = NULL;
-                       else
+                       } else {
                                pol = ERR_PTR(err);
+                       }
                } else