linux-kernel - [PATCH 3.16 185/204] Bluetooth: cmtp: cmtp_add_connection() should verify that it's dealing with l2cap socket

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Message-ID: <lsq.1514480744.453668051@decadent.org.uk>
Date:   Thu, 28 Dec 2017 17:05:44 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Al Viro" <viro@...iv.linux.org.uk>,
        "Marcel Holtmann" <marcel@...tmann.org>
Subject: [PATCH 3.16 185/204] Bluetooth: cmtp: cmtp_add_connection()
 should verify that it's dealing with l2cap socket

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 96c26653ce65bf84f3212f8b00d4316c1efcbf4c upstream.

... 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>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bluetooth/cmtp/core.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -334,6 +334,9 @@ int cmtp_add_connection(struct cmtp_conn
 
 	BT_DBG("");
 
+	if (!l2cap_is_socket(sock))
+		return -EBADFD;
+
 	session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
 	if (!session)
 		return -ENOMEM;