netdev - [PATCH 2/3] cmtp: cmtp_add_connection() should verify that it's dealing with l2cap socket

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Message-Id: <1418970059-32486-2-git-send-email-viro@ZenIV.linux.org.uk>
Date:	Fri, 19 Dec 2014 06:20:58 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	David Miller <davem@...emloft.net>
Cc:	Marcel Holtmann <marcel@...tmann.org>, netdev@...r.kernel.org,
	linux-bluetooth@...r.kernel.org
Subject: [PATCH 2/3] cmtp: cmtp_add_connection() should verify that it's dealing with l2cap socket

From: Al Viro <viro@...iv.linux.org.uk>

... rather than relying on ciptool(8) never passing it anything else.  Give
it e.g. an AF_UNIX connected socket (from socketpair(2)) and it'll oops,
trying to evaluate &l2cap_pi(sock->sk)->chan->dst...

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 net/bluetooth/cmtp/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c
index 67fe5e8..fd57db8 100644
--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -333,6 +333,8 @@ int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock)
 	int i, err;
 
 	BT_DBG("");
+	if (!l2cap_is_socket(sock))
+		return -EBADFD;
 
 	session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
 	if (!session)
-- 
2.1.3

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