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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 2/5] netfilter: nft_socket: fix erroneous socket assignment
Date: Wed,  4 Sep 2019 21:36:43 +0200
Message-ID: <20190904193646.23830-3-pablo@netfilter.org> (raw)
In-Reply-To: <20190904193646.23830-1-pablo@netfilter.org>

From: Fernando Fernandez Mancera <ffmancera@riseup.net>

The socket assignment is wrong, see skb_orphan():
When skb->destructor callback is not set, but skb->sk is set, this hits BUG().

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1651813
Fixes: 554ced0a6e29 ("netfilter: nf_tables: add support for native socket matching")
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nft_socket.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/nft_socket.c b/net/netfilter/nft_socket.c
index d7f3776dfd71..637ce3e8c575 100644
--- a/net/netfilter/nft_socket.c
+++ b/net/netfilter/nft_socket.c
@@ -47,9 +47,6 @@ static void nft_socket_eval(const struct nft_expr *expr,
 		return;
 	}
 
-	/* So that subsequent socket matching not to require other lookups. */
-	skb->sk = sk;
-
 	switch(priv->key) {
 	case NFT_SOCKET_TRANSPARENT:
 		nft_reg_store8(dest, inet_sk_transparent(sk));
@@ -66,6 +63,9 @@ static void nft_socket_eval(const struct nft_expr *expr,
 		WARN_ON(1);
 		regs->verdict.code = NFT_BREAK;
 	}
+
+	if (sk != skb->sk)
+		sock_gen_put(sk);
 }
 
 static const struct nla_policy nft_socket_policy[NFTA_SOCKET_MAX + 1] = {
-- 
2.11.0


  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-04 19:36 [PATCH 0/5] Netfilter fixes for net Pablo Neira Ayuso
2019-09-04 19:36 ` [PATCH 1/5] netfilter: bridge: Drops IPv6 packets if IPv6 module is not loaded Pablo Neira Ayuso
2019-09-04 19:36 ` Pablo Neira Ayuso [this message]
2019-09-04 19:36 ` [PATCH 3/5] netfilter: nft_fib_netdev: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled Pablo Neira Ayuso
2019-09-04 19:36 ` [PATCH 4/5] netfilter: ctnetlink: honor IPS_OFFLOAD flag Pablo Neira Ayuso
2019-09-04 19:36 ` [PATCH 5/5] netfilter: nf_flow_table: set default timeout after successful insertion Pablo Neira Ayuso
2019-09-04 22:04 ` [PATCH 0/5] Netfilter fixes for net David Miller

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