From: Xiaotian Feng <dfeng@redhat.com>
Date: Mon, 31 May 2010 14:41:09 +0000 (+0200)
Subject: netfilter: don't xt_jumpstack_alloc twice in xt_register_table
X-Git-Tag: firefly_0821_release~9833^2~1353^2~48^2~3
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c936e8bd1de2fa50c49e3df6fa5036bf07870b67;p=firefly-linux-kernel-4.4.55.git

netfilter: don't xt_jumpstack_alloc twice in xt_register_table

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.

Signed-off-by: Xiaotian Feng <dfeng@redhat.com>
Cc: Patrick McHardy <kaber@trash.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jan Engelhardt <jengelh@medozas.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Acked-By: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
---

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 445de702b8b7..47b1e7917a9c 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) {