Re: [PATCH] netfilter: don't xt_jumpstack_alloc twice inxt_register_table

[Jan Engelhardt]

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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