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drivers: base: transport_class: fix resource leak when transport_add_device() fails 

[ Upstream commit e5da06b27f ]

The normal call sequence of using transport class is:

Add path:
transport_setup_device()
  transport_setup_classdev()  // call sas_host_setup() here
transport_add_device()	      // if fails, need call transport_destroy_device()
transport_configure_device()

Remove path:
transport_remove_device()
  transport_remove_classdev  // call sas_host_remove() here
transport_destroy_device()

If transport_add_device() fails, need call transport_destroy_device()
to free memory, but in this case, ->remove() is not called, and the
resources allocated in ->setup() are leaked. So fix these leaks by
calling ->remove() in transport_add_class_device() if it returns error.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221115031638.3816551-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang 2022-11-15 11:16:38 +08:00 committed by Greg Kroah-Hartman
parent e77745640f
commit 29274780dd
1 changed files with 16 additions and 1 deletions
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17
drivers/base/transport_class.c
View File

@ -155,12 +155,27 @@ static int transport_add_class_device(struct attribute_container *cont,
struct device *dev,
struct device *classdev)
{
struct transport_class *tclass = class_to_transport_class(cont->class);
int error = attribute_container_add_class_device(classdev);
struct transport_container *tcont =
attribute_container_to_transport_container(cont);
if (!error && tcont->statistics)
if (error)
goto err_remove;
if (tcont->statistics) {
error = sysfs_create_group(&classdev->kobj, tcont->statistics);
if (error)
goto err_del;
}
return 0;
err_del:
attribute_container_class_device_del(classdev);
err_remove:
if (tclass->remove)
tclass->remove(tcont, dev, classdev);
return error;
}