4.18-stable review patch. If anyone has any objections, please let me know.
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From: Lukas Wunner lukas@wunner.de
commit 4ce6435820d1f1cc2c2788e232735eb244bcc8a3 upstream.
If addition of sysfs files fails on registration of a hotplug slot, the struct pci_slot as well as the entry in the slot_list is leaked. The issue has been present since the hotplug core was introduced in 2002: https://git.kernel.org/tglx/history/c/a8a2069f432c
Perhaps the idea was that even though sysfs addition fails, the slot should still be usable. But that's not how drivers use the interface, they abort probe if a non-zero value is returned.
Signed-off-by: Lukas Wunner lukas@wunner.de Signed-off-by: Bjorn Helgaas bhelgaas@google.com Cc: stable@vger.kernel.org # v2.4.15+ Cc: Greg Kroah-Hartman greg@kroah.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/pci/hotplug/pci_hotplug_core.c | 9 +++++++++ 1 file changed, 9 insertions(+)
--- a/drivers/pci/hotplug/pci_hotplug_core.c +++ b/drivers/pci/hotplug/pci_hotplug_core.c @@ -438,8 +438,17 @@ int __pci_hp_register(struct hotplug_slo list_add(&slot->slot_list, &pci_hotplug_slot_list);
result = fs_add_slot(pci_slot); + if (result) + goto err_list_del; + kobject_uevent(&pci_slot->kobj, KOBJ_ADD); dbg("Added slot %s to the list\n", name); + goto out; + +err_list_del: + list_del(&slot->slot_list); + pci_slot->hotplug = NULL; + pci_destroy_slot(pci_slot); out: mutex_unlock(&pci_hp_mutex); return result;