linux-kernel - Re: net/nfc: GPF in llcp_sock

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Date:	Fri, 1 Jan 2016 15:48:59 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: net/nfc: GPF in llcp_sock_getname

On Fri, Jan 1, 2016 at 5:58 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> GPF seems to be caused by a data race on socket state.

Seems you are right, I think the following patch should work:

diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c
index ecf0a01..5a91997 100644
--- a/net/nfc/llcp_sock.c
+++ b/net/nfc/llcp_sock.c
@@ -500,7 +500,7 @@ static int llcp_sock_getname(struct socket *sock,
struct sockaddr *uaddr,
        struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
        DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);

-       if (llcp_sock == NULL || llcp_sock->dev == NULL)
+       if (llcp_sock == NULL || sk->sk_state == LLCP_CLOSED)
                return -EBADFD;

        pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
--
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