linux-kernel - [PATCH 3.2 86/94] Bluetooth: bnep: bnep_add_connection() should verify that it's dealing with l2cap socket

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Message-ID: <lsq.1514480352.811708081@decadent.org.uk>
Date:   Thu, 28 Dec 2017 16:59:12 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Marcel Holtmann" <marcel@...tmann.org>,
        "Al Viro" <viro@...iv.linux.org.uk>
Subject: [PATCH 3.2 86/94] Bluetooth: bnep: bnep_add_connection() should
 verify that it's  dealing with l2cap socket

3.2.97-rc1 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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/bluetooth/bnep/core.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -560,6 +560,9 @@ int bnep_add_connection(struct bnep_conn
 
 	BT_DBG("");
 
+	if (!l2cap_is_socket(sock))
+		return -EBADFD;
+
 	baswap((void *) dst, &bt_sk(sock->sk)->dst);
 	baswap((void *) src, &bt_sk(sock->sk)->src);