linux-kernel - Re: [PATCH] netfilter: don't xt_jumpstack_alloc twice in xt_register

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Message-ID: <alpine.LSU.2.01.1005311350580.31799@obet.zrqbmnf.qr>
Date:	Mon, 31 May 2010 13:51:37 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Xiaotian Feng <dfeng@...hat.com>
cc:	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH] netfilter: don't xt_jumpstack_alloc twice in
 xt_register_table


On Monday 2010-05-31 13:06, Xiaotian Feng wrote:

>In xt_register_table, xt_jumpstack_alloc is called first, later
>xt_replace_table is used. But in xt_replace_table, xt_jumpstack_alloc
>will be used again. Then the memory allocated by previous xt_jumpstack_alloc
>will be leaked. We can simply remove the previous xt_jumpstack_alloc because
>there aren't any users of newinfo between xt_jumpstack_alloc and
>xt_replace_table.

Indeed that seems to be so.

>diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
>index 445de70..47b1e79 100644
>--- a/net/netfilter/x_tables.c
>+++ b/net/netfilter/x_tables.c
>@@ -844,10 +844,6 @@ struct xt_table *xt_register_table(struct net *net,
> 	struct xt_table_info *private;
> 	struct xt_table *t, *table;
> 
>-	ret = xt_jumpstack_alloc(newinfo);
>-	if (ret < 0)
>-		return ERR_PTR(ret);
>-
> 	/* Don't add one object to multiple lists. */
> 	table = kmemdup(input_table, sizeof(struct xt_table), GFP_KERNEL);
> 	if (!table) {
--
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