Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755192AbaK0JO3 (ORCPT ); Thu, 27 Nov 2014 04:14:29 -0500 Received: from mail.kernel.org ([198.145.19.201]:41526 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754036AbaK0IrF (ORCPT ); Thu, 27 Nov 2014 03:47:05 -0500 From: lizf@kernel.org To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Thomas Pugliese , Greg Kroah-Hartman , Zefan Li Subject: [PATCH 3.4 27/91] uwb: init beacon cache entry before registering uwb device Date: Thu, 27 Nov 2014 16:42:10 +0800 Message-Id: <1417077794-9299-27-git-send-email-lizf@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1417077368-9217-1-git-send-email-lizf@kernel.org> References: <1417077368-9217-1-git-send-email-lizf@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Pugliese 3.4.105-rc1 review patch. If anyone has any objections, please let me know. ------------------ commit 675f0ab2fe5a0f7325208e60b617a5f32b86d72c upstream. Make sure the uwb_dev->bce entry is set before calling uwb_dev_add in uwbd_dev_onair so that usermode will only see the device after it is properly initialized. This fixes a kernel panic that can occur if usermode tries to access the IEs sysfs attribute of a UWB device before the driver has had a chance to set the beacon cache entry. Signed-off-by: Thomas Pugliese Signed-off-by: Greg Kroah-Hartman [lizf: Backported to 3.4: adjust context] Signed-off-by: Zefan Li --- drivers/uwb/lc-dev.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/uwb/lc-dev.c b/drivers/uwb/lc-dev.c index 5241f1d..3c9e929 100644 --- a/drivers/uwb/lc-dev.c +++ b/drivers/uwb/lc-dev.c @@ -441,16 +441,19 @@ void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce) uwb_dev->mac_addr = *bce->mac_addr; uwb_dev->dev_addr = bce->dev_addr; dev_set_name(&uwb_dev->dev, macbuf); + + /* plug the beacon cache */ + bce->uwb_dev = uwb_dev; + uwb_dev->bce = bce; + uwb_bce_get(bce); /* released in uwb_dev_sys_release() */ + result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc); if (result < 0) { dev_err(dev, "new device %s: cannot instantiate device\n", macbuf); goto error_dev_add; } - /* plug the beacon cache */ - bce->uwb_dev = uwb_dev; - uwb_dev->bce = bce; - uwb_bce_get(bce); /* released in uwb_dev_sys_release() */ + dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n", macbuf, devbuf, rc->uwb_dev.dev.parent->bus->name, dev_name(rc->uwb_dev.dev.parent)); @@ -458,6 +461,8 @@ void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce) return; error_dev_add: + bce->uwb_dev = NULL; + uwb_bce_put(bce); kfree(uwb_dev); return; } -- 1.9.1 -- 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/