netdev - [PATCH 6/7] netfilter: nf_tables: validate NFTA_SET

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Date:	Wed,  1 Jun 2016 14:03:23 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	netfilter-devel@...r.kernel.org
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 6/7] netfilter: nf_tables: validate NFTA_SET_TABLE parameter

From: Phil Turnbull <phil.turnbull@...cle.com>

If the NFTA_SET_TABLE parameter is missing and the NLM_F_DUMP flag is
not set, then a NULL pointer dereference is triggered in
nf_tables_set_lookup because ctx.table is NULL.

Signed-off-by: Phil Turnbull <phil.turnbull@...cle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_tables_api.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 2011977..6947e25 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2641,6 +2641,8 @@ static int nf_tables_getset(struct net *net, struct sock *nlsk,
 	/* Only accept unspec with dump */
 	if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
 		return -EAFNOSUPPORT;
+	if (!nla[NFTA_SET_TABLE])
+		return -EINVAL;
 
 	set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
 	if (IS_ERR(set))
-- 
2.1.4