From 0b7da0500bbf612fc532358c90aad4497309d61a Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Thu, 10 May 2007 16:45:17 +0200 Subject: [PATCH] [PATCH] driver-core: don't free devt_attr till the device is released 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 Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 67b79a7592a9..7d10d676ab03 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -93,6 +93,9 @@ static void device_release(struct kobject * kobj) { struct device * dev = to_dev(kobj); + kfree(dev->devt_attr); + dev->devt_attr = NULL; + if (dev->release) dev->release(dev); else if (dev->class && dev->class->dev_release) @@ -650,10 +653,8 @@ 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 -- 2.39.5