[3.5.y.z,extended,stable] Patch "Bluetooth: RFCOMM - Fix missing msg_namelen update in" has been added to staging queue

Submitted by Luis Henriques on May 1, 2013, 11:33 p.m.


Message ID 1367451236-19547-1-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques May 1, 2013, 11:33 p.m.
This is a note to let you know that I have just added a patch titled

    Bluetooth: RFCOMM - Fix missing msg_namelen update in

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



From f02d73787fae521288eba4a524f7b7d8506f8b67 Mon Sep 17 00:00:00 2001
From: Mathias Krause <minipli@googlemail.com>
Date: Sun, 7 Apr 2013 01:51:50 +0000
Subject: [PATCH] Bluetooth: RFCOMM - Fix missing msg_namelen update in

commit e11e0455c0d7d3d62276a0c55d9dfbc16779d691 upstream.

If RFCOMM_DEFER_SETUP is set in the flags, rfcomm_sock_recvmsg() returns
early with 0 without updating the possibly set msg_namelen member. This,
in turn, leads to a 128 byte kernel stack leak in net/socket.c.

Fix this by updating msg_namelen in this case. For all other cases it
will be handled in bt_sock_stream_recvmsg().

Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
 net/bluetooth/rfcomm/sock.c | 1 +
 1 file changed, 1 insertion(+)


Patch hide | download patch | download mbox

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 20bd148..514bead 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -629,6 +629,7 @@  static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,

 	if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
+		msg->msg_namelen = 0;
 		return 0;