netdev - Re: [PATCH] ipv6: Fix possible NULL dereference in icmp6_dst

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Message-ID: <7f9bf5711001270435v29217b9cw15a49a1d71580cc5@mail.gmail.com>
Date:	Wed, 27 Jan 2010 14:35:10 +0200
From:	Atis Elsts <atis.elsts@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	djohnson@...rentnetworks.com, sakkiped@...rentnetworks.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: Fix possible NULL dereference in icmp6_dst_alloc

> On Wed, Jan 27, 2010 at 03:04:16AM -0800, David Miller wrote:
>> From: Jarek Poplawski <jarkao2@...il.com>
>> Date: Wed, 27 Jan 2010 10:34:17 +0000
>>
>> > (Btw, maybe it's a sign this might be more readable?)
>>
>> I welcome suggests that, tree wide, would make this harder
>> to misinterpret.

How about adding static inline functions for accessing the dst_entry
field in struct route via a cast? That way it would be immediately
obvious that invalid memory access is not going to happen. Like this:

static inline struct dst_entry *route_dst(struct rtable *rt)
{
	return (struct dst_entry *)rt;
}

static inline struct dst_entry *route6_dst(struct rt6_info *rt)
{
	return (struct dst_entry *)rt;
}

and so on...

Atis
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