drivers: base: transport_class: fix resource leak when transport_add_device() fails
authorYang Yingliang <yangyingliang@huawei.com>
Tue, 15 Nov 2022 03:16:38 +0000 (11:16 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 20 Jan 2023 13:22:53 +0000 (14:22 +0100)
commite5da06b27ff5a148e42265c8e306670a9d913969
treeb83c3190311d7f4fe0731fcdef3f2803cbd11815
parenta86367803838b369fe5486ac18771d14723c258c
drivers: base: transport_class: fix resource leak when transport_add_device() fails

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: 1da177e4c3f4 ("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>
drivers/base/transport_class.c