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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 4/9] netfilter: nft_tunnel: fix null-attribute check
Date: Thu, 16 Jan 2020 20:50:39 +0100
Message-ID: <20200116195044.326614-5-pablo@netfilter.org> (raw)
In-Reply-To: <20200116195044.326614-1-pablo@netfilter.org>

From: Florian Westphal <fw@strlen.de>

else we get null deref when one of the attributes is missing, both
must be non-null.

Reported-by: syzbot+76d0b80493ac881ff77b@syzkaller.appspotmail.com
Fixes: aaecfdb5c5dd8ba ("netfilter: nf_tables: match on tunnel metadata")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_tunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nft_tunnel.c b/net/netfilter/nft_tunnel.c
index 3d4c2ae605a8..d89c7c553030 100644
--- a/net/netfilter/nft_tunnel.c
+++ b/net/netfilter/nft_tunnel.c
@@ -76,7 +76,7 @@ static int nft_tunnel_get_init(const struct nft_ctx *ctx,
 	struct nft_tunnel *priv = nft_expr_priv(expr);
 	u32 len;
 
-	if (!tb[NFTA_TUNNEL_KEY] &&
+	if (!tb[NFTA_TUNNEL_KEY] ||
 	    !tb[NFTA_TUNNEL_DREG])
 		return -EINVAL;
 
-- 
2.11.0


  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-16 19:50 [PATCH 0/9] Netfilter updates for net Pablo Neira Ayuso
2020-01-16 19:50 ` [PATCH 1/9] netfilter: fix a use-after-free in mtype_destroy() Pablo Neira Ayuso
2020-01-16 19:50 ` [PATCH 2/9] netfilter: arp_tables: init netns pointer in xt_tgdtor_param struct Pablo Neira Ayuso
2020-01-16 19:50 ` [PATCH 3/9] netfilter: nf_tables: store transaction list locally while requesting module Pablo Neira Ayuso
2020-01-16 19:50 ` Pablo Neira Ayuso [this message]
2020-01-16 19:50 ` [PATCH 5/9] netfilter: nft_tunnel: ERSPAN_VERSION must not be null Pablo Neira Ayuso
2020-01-16 19:50 ` [PATCH 6/9] netfilter: nf_tables: remove WARN and add NLA_STRING upper limits Pablo Neira Ayuso
2020-01-16 19:50 ` [PATCH 7/9] netfilter: nf_tables: fix memory leak in nf_tables_parse_netdev_hooks() Pablo Neira Ayuso
2020-01-16 19:50 ` [PATCH 8/9] netfilter: nf_tables: fix flowtable list del corruption Pablo Neira Ayuso
2020-01-16 19:50 ` [PATCH 9/9] netfilter: nat: fix ICMP header corruption on ICMP errors Pablo Neira Ayuso
2020-01-17  9:37 ` [PATCH 0/9] Netfilter updates for net David Miller

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