Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755508AbaGHBFU (ORCPT ); Mon, 7 Jul 2014 21:05:20 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:55226 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753199AbaGGXyB (ORCPT ); Mon, 7 Jul 2014 19:54:01 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hedberg , Lukasz Rymanowski , Marcel Holtmann Subject: [PATCH 3.15 061/122] Bluetooth: Fix locking of hdev when calling into SMP code Date: Mon, 7 Jul 2014 16:57:03 -0700 Message-Id: <20140707235736.099175790@linuxfoundation.org> X-Mailer: git-send-email 2.0.0.254.g50f84e3 In-Reply-To: <20140707235734.234226883@linuxfoundation.org> References: <20140707235734.234226883@linuxfoundation.org> User-Agent: quilt/0.63-1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hedberg commit c73f94b8c093a615ce80eabbde0ac6eb9abfe31a upstream. The SMP code expects hdev to be unlocked since e.g. crypto functions will try to (re)lock it. Therefore, we need to release the lock before calling into smp.c from mgmt.c. Without this we risk a deadlock whenever the smp_user_confirm_reply() function is called. Signed-off-by: Johan Hedberg Tested-by: Lukasz Rymanowski Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/mgmt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -3032,8 +3032,13 @@ static int user_pairing_resp(struct sock } if (addr->type == BDADDR_LE_PUBLIC || addr->type == BDADDR_LE_RANDOM) { - /* Continue with pairing via SMP */ + /* Continue with pairing via SMP. The hdev lock must be + * released as SMP may try to recquire it for crypto + * purposes. + */ + hci_dev_unlock(hdev); err = smp_user_confirm_reply(conn, mgmt_op, passkey); + hci_dev_lock(hdev); if (!err) err = cmd_complete(sk, hdev->id, mgmt_op, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/