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| author | Maneesh Soni <maneesh@in.ibm.com> | 2005-08-16 15:15:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-08-16 21:06:24 -0700 |
| commit | 208f3d6175cb17772c5af202fe12373f90894ff4 (patch) | |
| tree | 86265a0aa2a8007e181e9edb279b2fab81b812ee | |
| parent | 12aaa0855b39b5464db953fedf399fa91ee365ed (diff) | |
| download | linux-stable-208f3d6175cb17772c5af202fe12373f90894ff4.tar.gz linux-stable-208f3d6175cb17772c5af202fe12373f90894ff4.tar.bz2 linux-stable-208f3d6175cb17772c5af202fe12373f90894ff4.zip | |
[PATCH] Driver core: potentially fix use after free in class_device_attr_show
This moves the code to free devt_attr from class_device_del() to
class_dev_release() which is called after the last reference to the
corresponding kobject() is gone.
This allows us to keep the devt_attr alive while the corresponding
sysfs file is open.
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | drivers/base/class.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c index 479c12570881..0154a1623b21 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -299,6 +299,11 @@ static void class_dev_release(struct kobject * kobj) pr_debug("device class '%s': release.\n", cd->class_id); + if (cd->devt_attr) { + kfree(cd->devt_attr); + cd->devt_attr = NULL; + } + if (cls->release) cls->release(cd); else { @@ -591,11 +596,8 @@ void class_device_del(struct class_device *class_dev) if (class_dev->dev) sysfs_remove_link(&class_dev->kobj, "device"); - if (class_dev->devt_attr) { + if (class_dev->devt_attr) class_device_remove_file(class_dev, class_dev->devt_attr); - kfree(class_dev->devt_attr); - class_dev->devt_attr = NULL; - } class_device_remove_attrs(class_dev); kobject_hotplug(&class_dev->kobj, KOBJ_REMOVE); |