| From daecaa6c1a244f29fb6e4df3e0bdba54dedfa6b6 Mon Sep 17 00:00:00 2001 |
| From: Mathias Krause <minipli@googlemail.com> |
| Date: Sun, 7 Apr 2013 01:51:50 +0000 |
| Subject: Bluetooth: RFCOMM - Fix missing msg_namelen update in rfcomm_sock_recvmsg() |
| |
| |
| From: Mathias Krause <minipli@googlemail.com> |
| |
| [ Upstream commit e11e0455c0d7d3d62276a0c55d9dfbc16779d691 ] |
| |
| 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(). |
| |
| Signed-off-by: Mathias Krause <minipli@googlemail.com> |
| Cc: Marcel Holtmann <marcel@holtmann.org> |
| Cc: Gustavo Padovan <gustavo@padovan.org> |
| Cc: Johan Hedberg <johan.hedberg@gmail.com> |
| Signed-off-by: David S. Miller <davem@davemloft.net> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| net/bluetooth/rfcomm/sock.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/net/bluetooth/rfcomm/sock.c |
| +++ b/net/bluetooth/rfcomm/sock.c |
| @@ -610,6 +610,7 @@ static int rfcomm_sock_recvmsg(struct ki |
| |
| if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { |
| rfcomm_dlc_accept(d); |
| + msg->msg_namelen = 0; |
| return 0; |
| } |
| |
