netdev - [patch] xfrm6: remove unneeded NULL check in __xfrm6

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Message-ID: <20120201074526.GC22179@elgon.mountain>
Date:	Wed, 1 Feb 2012 10:45:26 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"David S. Miller" <davem@...emloft.net>,
	steffen.klassert@...unet.com
Cc:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] xfrm6: remove unneeded NULL check in __xfrm6_output()

We don't check for NULL consistently in __xfrm6_output().  If "x" were
NULL here it would lead to an OOPs later.  I asked Steffen Klassert
about this and he suggested that we remove the NULL check.

On 10/29/11, Steffen Klassert <steffen.klassert@...unet.com> wrote:
>> net/ipv6/xfrm6_output.c
>>    148	
>>    149		if ((x && x->props.mode == XFRM_MODE_TUNNEL) &&
>>                           ^
>
> x can't be null here. It would be a bug if __xfrm6_output() is called
> without a xfrm_state attached to the skb. I think we can just remove
> this null check.

Cc: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 4eeff89..8755a30 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -146,7 +146,7 @@ static int __xfrm6_output(struct sk_buff *skb)
 		return -EMSGSIZE;
 	}
 
-	if ((x && x->props.mode == XFRM_MODE_TUNNEL) &&
+	if (x->props.mode == XFRM_MODE_TUNNEL &&
 	    ((skb->len > mtu && !skb_is_gso(skb)) ||
 		dst_allfrag(skb_dst(skb)))) {
 			return ip6_fragment(skb, x->outer_mode->afinfo->output_finish);
--
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