| From | Paul Gortmaker <> | Subject | [v2.6.34-stable 131/213] Bluetooth: RFCOMM - Fix missing msg_namelen update in rfcomm_sock_recvmsg() | Date | Wed, 5 Feb 2014 15:01:26 -0500 |
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From: Mathias Krause <minipli@googlemail.com>
------------------- This is a commit scheduled for the next v2.6.34 longterm release. http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git If you see a problem with using this for longterm, please comment. -------------------
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: Paul Gortmaker <paul.gortmaker@windriver.com> --- net/bluetooth/rfcomm/sock.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index 92aa7a012110..557122ee3e24 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -656,6 +656,7 @@ static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock, if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { rfcomm_dlc_accept(d); + msg->msg_namelen = 0; return 0; } -- 1.8.5.2
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