Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934361AbXEUTbk (ORCPT ); Mon, 21 May 2007 15:31:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1765033AbXEUTVw (ORCPT ); Mon, 21 May 2007 15:21:52 -0400 Received: from 216-99-217-87.dsl.aracnet.com ([216.99.217.87]:46417 "EHLO sous-sol.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765001AbXEUTVt (ORCPT ); Mon, 21 May 2007 15:21:49 -0400 Message-Id: <20070521191735.000962000@sous-sol.org> References: <20070521191612.800400000@sous-sol.org> User-Agent: quilt/0.46-1 Date: Mon, 21 May 2007 12:16:52 -0700 From: Chris Wright To: linux-kernel@vger.kernel.org, stable@kernel.org, Greg KH Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Tejun Heo , Alan Stern , linux-usb-devel@lists.sourceforge.net, Chris Rankin Subject: [patch 40/69] driver-core: dont free devt_attr till the device is released Content-Disposition: inline; filename=driver-core-don-t-free-devt_attr-till-the-device-is-released.patch Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1909 Lines: 57 -stable review patch. If anyone has any objections, please let us know. --------------------- From: Tejun Heo Currently, devt_attr for the "dev" file is freed immediately on device removal, but if the "dev" sysfs file is open when a device is removed, sysfs will access its attribute structure for further access including close resulting in jumping to garbled address. Fix it by postponing freeing devt_attr to device release time. Note that devt_attr for class_device is already freed on release. This bug is reported by Chris Rankin as bugzilla bug#8198. Signed-off-by: Tejun Heo Cc: Chris Rankin Signed-off-by: Chris Wright --- Applies well to 2.6.20 and 21. As sysfs-immediate-disconnect doesn't seem to be included in 2.6.22, this should be included in linus#master too (applies well there as well). drivers/base/core.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- linux-2.6.21.1.orig/drivers/base/core.c +++ linux-2.6.21.1/drivers/base/core.c @@ -93,6 +93,9 @@ static void device_release(struct kobjec { struct device * dev = to_dev(kobj); + kfree(dev->devt_attr); + dev->devt_attr = NULL; + if (dev->release) dev->release(dev); else if (dev->type && dev->type->release) @@ -765,10 +768,8 @@ void device_del(struct device * dev) if (parent) klist_del(&dev->knode_parent); - if (dev->devt_attr) { + if (dev->devt_attr) device_remove_file(dev, dev->devt_attr); - kfree(dev->devt_attr); - } if (dev->class) { sysfs_remove_link(&dev->kobj, "subsystem"); /* If this is not a "fake" compatible device, remove the -- - 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/