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Message-ID: <20060727171711.6fe210aa@gondolin.boeblingen.de.ibm.com>
Date: Thu, 27 Jul 2006 17:17:11 +0200
From: Cornelia Huck <cornelia.huck@...ibm.com>
To: Andrew Morton <akpm@...l.org>
Cc: Greg K-H <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: [Patch] [2.6.18-rc2-mm1] Return code checking for make_class_name()
From: Cornelia Huck <cornelia.huck@...ibm.com>
make_class_name() may return an error pointer. Make sure that all
callers in the driver core check for it.
CC: Greg K-H <greg@...ah.com>
Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>
class.c | 25 ++++++++++++++++++++++---
core.c | 11 +++++++----
2 files changed, 29 insertions(+), 7 deletions(-)
diff -Naurp linux-2.6.18-rc2-mm1/drivers/base/class.c linux-2.6.18-rc2-mm1+CH/drivers/base/class.c
--- linux-2.6.18-rc2-mm1/drivers/base/class.c 2006-07-27 16:43:25.000000000 +0200
+++ linux-2.6.18-rc2-mm1+CH/drivers/base/class.c 2006-07-27 16:39:14.000000000 +0200
@@ -602,6 +602,11 @@ int class_device_add(struct class_device
if (class_dev->dev) {
class_name = make_class_name(class_dev->class->name,
&class_dev->kobj);
+ if (IS_ERR(class_name)) {
+ error = PTR_ERR(class_name);
+ class_name = NULL;
+ goto out6;
+ }
error = sysfs_create_link(&class_dev->kobj,
&class_dev->dev->kobj, "device");
if (error)
@@ -741,7 +746,11 @@ void class_device_del(struct class_devic
class_name = make_class_name(class_dev->class->name,
&class_dev->kobj);
sysfs_remove_link(&class_dev->kobj, "device");
- sysfs_remove_link(&class_dev->dev->kobj, class_name);
+ if (!IS_ERR(class_name))
+ sysfs_remove_link(&class_dev->dev->kobj, class_name);
+ else
+ /* Hmm, don't know what else to do */
+ class_name = NULL;
}
sysfs_remove_link(&class_dev->kobj, "subsystem");
class_device_remove_file(class_dev, &class_dev->uevent_attr);
@@ -804,10 +813,15 @@ int class_device_rename(struct class_dev
pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id,
new_name);
- if (class_dev->dev)
+ if (class_dev->dev) {
old_class_name = make_class_name(class_dev->class->name,
&class_dev->kobj);
-
+ if (IS_ERR(old_class_name)) {
+ error = PTR_ERR(old_class_name);
+ old_class_name = NULL;
+ goto out;
+ }
+ }
strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN);
error = kobject_rename(&class_dev->kobj, new_name);
@@ -815,6 +829,11 @@ int class_device_rename(struct class_dev
if (class_dev->dev) {
new_class_name = make_class_name(class_dev->class->name,
&class_dev->kobj);
+ if (IS_ERR(new_class_name)) {
+ error = PTR_ERR(new_class_name);
+ new_class_name = NULL;
+ goto out;
+ }
error = sysfs_create_link(&class_dev->dev->kobj,
&class_dev->kobj, new_class_name);
if (error)
diff -Naurp linux-2.6.18-rc2-mm1/drivers/base/core.c linux-2.6.18-rc2-mm1+CH/drivers/base/core.c
--- linux-2.6.18-rc2-mm1/drivers/base/core.c 2006-07-27 16:43:25.000000000 +0200
+++ linux-2.6.18-rc2-mm1+CH/drivers/base/core.c 2006-07-27 16:41:03.000000000 +0200
@@ -608,11 +608,14 @@ void device_del(struct device * dev)
sysfs_remove_link(&dev->kobj, "subsystem");
sysfs_remove_link(&dev->class->subsys.kset.kobj, dev->bus_id);
class_name = make_class_name(dev->class->name, &dev->kobj);
- if (parent) {
- sysfs_remove_link(&dev->kobj, "device");
- sysfs_remove_link(&dev->parent->kobj, class_name);
+ if (!IS_ERR(class_name)) {
+ if (parent) {
+ sysfs_remove_link(&dev->kobj, "device");
+ sysfs_remove_link(&dev->parent->kobj,
+ class_name);
+ }
+ kfree(class_name);
}
- kfree(class_name);
down(&dev->class->sem);
list_del_init(&dev->node);
up(&dev->class->sem);
-
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