Commit 35d9b0c9 authored Dec 05, 2010 by Eric Dumazet Committed by David S. Miller Dec 08, 2010

llc: fix a device refcount imbalance



Le dimanche 05 décembre 2010 à 12:23 +0100, Eric Dumazet a écrit :
> Le dimanche 05 décembre 2010 à 09:19 +0100, Eric Dumazet a écrit :
>
> > Hmm..
> >
> > If somebody can explain why RTNL is held in arp_ioctl() (and therefore
> > in arp_req_delete()), we might first remove RTNL use in arp_ioctl() so
> > that your patch can be applied.
> >
> > Right now it is not good, because RTNL wont be necessarly held when you
> > are going to call arp_invalidate() ?
>
> While doing this analysis, I found a refcount bug in llc, I'll send a
> patch for net-2.6

Oh well, of course I must first fix the bug in net-2.6, and wait David
pull the fix in net-next-2.6 before sending this rcu conversion.

Note: this patch should be sent to stable teams (2.6.34 and up)

[PATCH net-2.6] llc: fix a device refcount imbalance

commit abf9d537 (llc: add support for SO_BINDTODEVICE) added one
refcount imbalance in llc_ui_bind(), because dev_getbyhwaddr() doesnt
take a reference on device, while dev_get_by_index() does.

Fix this using RCU locking. And since an RCU conversion will be done for
2.6.38 for dev_getbyhwaddr(), put the rcu_read_lock/unlock exactly at
their final place.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: stable@kernel.org
Cc: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 75c1c825

net/llc/af_llc.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -317,8 +317,9 @@ static int llc_ui_bind(struct socket sock, struct sockaddr uaddr, int addrlen)
		goto out;
		rc = -ENODEV;
		rtnl_lock();
		rcu_read_lock();
		if (sk->sk_bound_dev_if) {
		llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
		llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
		if (llc->dev) {
		if (!addr->sllc_arphrd)
		addr->sllc_arphrd = llc->dev->type;
		@@ -329,13 +330,13 @@ static int llc_ui_bind(struct socket sock, struct sockaddr uaddr, int addrlen)
		!llc_mac_match(addr->sllc_mac,
		llc->dev->dev_addr)) {
		rc = -EINVAL;
		dev_put(llc->dev);
		llc->dev = NULL;
		}
		}
		} else
		llc->dev = dev_getbyhwaddr(&init_net, addr->sllc_arphrd,
		addr->sllc_mac);
		rcu_read_unlock();
		rtnl_unlock();
		if (!llc->dev)
		goto out;

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