netdev - Re: [Patch] arp: fix a regression in arp

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Date:	Sun, 23 Dec 2012 15:58:52 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Julian Anastasov <ja@....bg>
Subject: Re: [Patch] arp: fix a regression in arp_solicit()

On Sun, Dec 23, 2012 at 3:49 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Sun, Dec 23, 2012 at 3:42 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> From: Cong Wang <xiyou.wangcong@...il.com>
>>
>> Sedat reported the following commit caused a regression:
>>
>> 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
>>
>> This is due to the 6th parameter of arp_send() needs to be NULL
>> for broatcase case, the above commit changed it to all-zero non-NULL
>> hw addr.
>>
>
> s/broatcase/broadcast ?
>

While at it you might enhance the label with "ipv4"?

ipv4: arp: fix a regression in arp_solicit()

> - Sedat -
>
>> Reported-by: Sedat Dilek <sedat.dilek@...il.com>
>> Tested-by: Sedat Dilek <sedat.dilek@...il.com>
>> Cc: Sedat Dilek <sedat.dilek@...il.com>
>> Cc: Eric Dumazet <edumazet@...gle.com>
>> Cc: David S. Miller <davem@...emloft.net>
>> Cc: Julian Anastasov <ja@....bg>
>> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>>
>> ---
>> diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
>> index 1169ed4..9547a273 100644
>> --- a/net/ipv4/arp.c
>> +++ b/net/ipv4/arp.c
>> @@ -321,7 +321,7 @@ static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb)
>>  static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
>>  {
>>         __be32 saddr = 0;
>> -       u8 dst_ha[MAX_ADDR_LEN];
>> +       u8 dst_ha[MAX_ADDR_LEN], *dst_hw = NULL;
>>         struct net_device *dev = neigh->dev;
>>         __be32 target = *(__be32 *)neigh->primary_key;
>>         int probes = atomic_read(&neigh->probes);
>> @@ -364,8 +364,8 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
>>                 if (!(neigh->nud_state & NUD_VALID))
>>                         pr_debug("trying to ucast probe in NUD_INVALID\n");
>>                 neigh_ha_snapshot(dst_ha, neigh, dev);
>> +               dst_hw = dst_ha;
>>         } else {
>> -               memset(dst_ha, 0, dev->addr_len);
>>                 probes -= neigh->parms->app_probes;
>>                 if (probes < 0) {
>>  #ifdef CONFIG_ARPD
>> @@ -376,7 +376,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
>>         }
>>
>>         arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr,
>> -                dst_ha, dev->dev_addr, NULL);
>> +                dst_hw, dev->dev_addr, NULL);
>>  }
>>
>>  static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip)
--
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