linux-kernel - [PATCH 3.18 12/92] Bluetooth: bnep: bnep_add_connection() should verify that its dealing with l2cap socket

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Message-Id: <20170809202155.989820329@linuxfoundation.org>
Date:   Wed,  9 Aug 2017 13:36:40 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH 3.18 12/92] Bluetooth: bnep: bnep_add_connection() should verify that its dealing with l2cap socket

3.18-stable review patch.  If anyone has any objections, please let me know.

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

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

commit 71bb99a02b32b4cc4265118e85f6035ca72923f0 upstream.

same story as cmtp

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/bluetooth/bnep/core.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -533,6 +533,9 @@ int bnep_add_connection(struct bnep_conn
 
 	BT_DBG("");
 
+	if (!l2cap_is_socket(sock))
+		return -EBADFD;
+
 	baswap((void *) dst, &l2cap_pi(sock->sk)->chan->dst);
 	baswap((void *) src, &l2cap_pi(sock->sk)->chan->src);