-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/