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authorHannes Reinecke <hare@suse.de>2012-04-16 17:06:25 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-19 02:39:52 +0400
commita15d49fd3094cff90e5410ca454a870e0a722fe1 (patch)
treef3e458fa4ce3524f756e0faa48d5ed2400c022bf /drivers/base/bus.c
parent97ec448aeadff55234368a89c4a07a7ef290a084 (diff)
downloadlinux-a15d49fd3094cff90e5410ca454a870e0a722fe1.tar.xz
driver core: check start node in klist_iter_init_node
klist_iter_init_node() takes a node as a start argument. However, this node might not be valid anymore. This patch updates the klist_iter_init_node() and dependent functions to return an error if so. All calling functions have been audited to check for a return code here. Signed-off-by: Hannes Reinecke <hare@suse.de> Cc: Greg Kroah-Hartmann <gregkh@linuxfoundation.org> Cc: Kay Sievers <kay@vrfy.org> Cc: Stable Kernel <stable@kernel.org> Cc: Linux Kernel <linux-kernel@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/bus.c')
-rw-r--r--drivers/base/bus.c46
1 files changed, 29 insertions, 17 deletions
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 2bcef657a60c..76aed01a8b2c 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -296,11 +296,13 @@ int bus_for_each_dev(struct bus_type *bus, struct device *start,
if (!bus)
return -EINVAL;
- klist_iter_init_node(&bus->p->klist_devices, &i,
- (start ? &start->p->knode_bus : NULL));
- while ((dev = next_device(&i)) && !error)
- error = fn(dev, data);
- klist_iter_exit(&i);
+ error = klist_iter_init_node(&bus->p->klist_devices, &i,
+ (start ? &start->p->knode_bus : NULL));
+ if (!error) {
+ while ((dev = next_device(&i)) && !error)
+ error = fn(dev, data);
+ klist_iter_exit(&i);
+ }
return error;
}
EXPORT_SYMBOL_GPL(bus_for_each_dev);
@@ -330,8 +332,10 @@ struct device *bus_find_device(struct bus_type *bus,
if (!bus)
return NULL;
- klist_iter_init_node(&bus->p->klist_devices, &i,
- (start ? &start->p->knode_bus : NULL));
+ if (klist_iter_init_node(&bus->p->klist_devices, &i,
+ (start ? &start->p->knode_bus : NULL)) < 0)
+ return NULL;
+
while ((dev = next_device(&i)))
if (match(dev, data) && get_device(dev))
break;
@@ -384,7 +388,9 @@ struct device *subsys_find_device_by_id(struct bus_type *subsys, unsigned int id
return NULL;
if (hint) {
- klist_iter_init_node(&subsys->p->klist_devices, &i, &hint->p->knode_bus);
+ if (klist_iter_init_node(&subsys->p->klist_devices, &i,
+ &hint->p->knode_bus) < 0)
+ return NULL;
dev = next_device(&i);
if (dev && dev->id == id && get_device(dev)) {
klist_iter_exit(&i);
@@ -446,11 +452,13 @@ int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
if (!bus)
return -EINVAL;
- klist_iter_init_node(&bus->p->klist_drivers, &i,
- start ? &start->p->knode_bus : NULL);
- while ((drv = next_driver(&i)) && !error)
- error = fn(drv, data);
- klist_iter_exit(&i);
+ error = klist_iter_init_node(&bus->p->klist_drivers, &i,
+ start ? &start->p->knode_bus : NULL);
+ if (!error) {
+ while ((drv = next_driver(&i)) && !error)
+ error = fn(drv, data);
+ klist_iter_exit(&i);
+ }
return error;
}
EXPORT_SYMBOL_GPL(bus_for_each_drv);
@@ -1111,15 +1119,19 @@ EXPORT_SYMBOL_GPL(bus_sort_breadthfirst);
* otherwise if it is NULL, the iteration starts at the beginning of
* the list.
*/
-void subsys_dev_iter_init(struct subsys_dev_iter *iter, struct bus_type *subsys,
- struct device *start, const struct device_type *type)
+int subsys_dev_iter_init(struct subsys_dev_iter *iter, struct bus_type *subsys,
+ struct device *start, const struct device_type *type)
{
struct klist_node *start_knode = NULL;
+ int error;
if (start)
start_knode = &start->p->knode_bus;
- klist_iter_init_node(&subsys->p->klist_devices, &iter->ki, start_knode);
- iter->type = type;
+ error = klist_iter_init_node(&subsys->p->klist_devices, &iter->ki,
+ start_knode);
+ if (!error)
+ iter->type = type;
+ return error;
}
EXPORT_SYMBOL_GPL(subsys_dev_iter_init);