netdev - Re: [PATCH] net: sk_prot_alloc() should not blindly overwrite memory

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Date:	Sat, 11 Jul 2009 20:27:27 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	emil.s.tantilov@...el.com, emils.tantilov@...il.com,
	netdev@...r.kernel.org, jesse.brandeburg@...el.com,
	jeffrey.t.kirsher@...el.com, jolsa@...hat.com, kaber@...sh.net,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [PATCH] net: sk_prot_alloc() should not blindly overwrite
 memory

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 09 Jul 2009 07:36:05 +0200

> [PATCH] net: sk_prot_alloc() should not blindly overwrite memory
> 
> Some sockets use SLAB_DESTROY_BY_RCU, and our RCU code correctness
> depends on sk->sk_nulls_node.next being always valid. A NULL
> value is not allowed as it might fault a lockless reader.
> 
> Current sk_prot_alloc() implementation doesnt respect this hypothesis,
> calling kmem_cache_alloc() with __GFP_ZERO. Just call memset() around
> the forbidden field.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

APplied and queued up for -stable.
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