netdev - Re: [PATCH,RESEND] XFRM,IPv6: initialize ip6_dst_blackhole_ops.kmem

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Date:	Wed, 01 Oct 2008 02:38:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arno@...isbad.org
Cc:	netdev@...r.kernel.org, ben.thery@...il.com
Subject: Re: [PATCH,RESEND] XFRM,IPv6: initialize
 ip6_dst_blackhole_ops.kmem_cachep

From: arno@...isbad.org (Arnaud Ebalard)
Date: Wed, 01 Oct 2008 11:26:31 +0200

> With the switch to a default value of 1 for xfrm_larval_drop in commit
> 28faa979746b2352cd78a376bf9f52db953bda46 (ipsec: Make xfrm_larval_drop
> default to 1), what seems to be a bug manage to surface on one of my
> test box running today's net-next (*).
> 
> When xfrm_tmpl_resolve() returns -EAGAIN in __xfrm_lookup(), the caller
> is returned -EREMOTE and is expected to install a blackhole route. For
> IPv6, the call to dst_alloc(&ip6_dst_blackhole_ops) performed by
> ip6_dst_blackhole() produces the error provided below, because
> kmem_cachep attribute seems to be uninitialized. This does not happen
> when xfrm_larval_drop is set to 0.
> 
> The patch below against today's net-next. Benjamin (in CC) reported on
> the introduction of the bug (f2fc6a54585a1be6669613a31fbaba2ecbadcd36)
> while adding network namespaces support to ipv6 routes.

Applied to net-2.6, thanks Arnaud!
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