linux-kernel - Re: [3.8-rc1] Networking problems after pulling-in net.git#master

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Date:	Sun, 23 Dec 2012 16:10:44 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Cong Wang <xiyou.wangcong@...il.com>
cc:	sedat.dilek@...il.com, Borislav Petkov <bp@...en8.de>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [3.8-rc1] Networking problems after pulling-in net.git#master


	Hello,

On Sun, 23 Dec 2012, Cong Wang wrote:

> On Sun, Dec 23, 2012 at 9:19 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> >
> > The culprit commit here seems to be...
> >
> > commit 9650388b5c56578fdccc79c57a8c82fb92b8e7f1
> > Author: Eric Dumazet <edumazet@...gle.com>
> > Date:   Fri Dec 21 07:32:10 2012 +0000
> >
> >     ipv4: arp: fix a lockdep splat in arp_solicit()
> 
> Can you try the following one-line fix?
> 
> Thanks.
> 
> ------------>
> 
> diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
> index 1169ed4..75e0d7c 100644
> --- a/net/ipv4/arp.c
> +++ b/net/ipv4/arp.c
> @@ -365,7 +365,7 @@ static void arp_solicit(struct neighbour *neigh,
> struct sk_buff *skb)
>                         pr_debug("trying to ucast probe in NUD_INVALID\n");
>                 neigh_ha_snapshot(dst_ha, neigh, dev);
>         } else {
> -               memset(dst_ha, 0, dev->addr_len);
> +               memcpy(dst_ha, dev->broadcast, MAX_ADDR_LEN);

	Use dev->addr_len instead of MAX_ADDR_LEN or
better provide NULL ptr to arp_send as before the
"ipv4: arp: fix a lockdep splat in arp_solicit" change,
for example by keeping dst_ha as pointer and using another
name for the temp array that is now dst_ha[MAX_ADDR_LEN].

>                 probes -= neigh->parms->app_probes;
>                 if (probes < 0) {
>  #ifdef CONFIG_ARPD

Regards

--
Julian Anastasov <ja@....bg>
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