projects / thirdparty / kernel / stable-queue.git / blame
| Commit | Line | Data |
|---|---|---|
| 37554d48 SL |
1 | From df2cc856ab698479bc93f9e09da627f580be57d4 Mon Sep 17 00:00:00 2001 |
| 2 | From: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> | |
| 3 | Date: Fri, 22 Mar 2019 13:27:21 -0500 | |
| 4 | Subject: PCI: rpadlpar: Fix leaked device_node references in add/remove paths | |
| 5 | ||
| 6 | [ Upstream commit fb26228bfc4ce3951544848555c0278e2832e618 ] | |
| 7 | ||
| 8 | The find_dlpar_node() helper returns a device node with its reference | |
| 9 | incremented. Both the add and remove paths use this helper for find the | |
| 10 | appropriate node, but fail to release the reference when done. | |
| 11 | ||
| 12 | Annotate the find_dlpar_node() helper with a comment about the incremented | |
| 13 | reference count and call of_node_put() on the obtained device_node in the | |
| 14 | add and remove paths. Also, fixup a reference leak in the find_vio_slot() | |
| 15 | helper where we fail to call of_node_put() on the vdevice node after we | |
| 16 | iterate over its children. | |
| 17 | ||
| 18 | Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> | |
| 19 | Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> | |
| 20 | Signed-off-by: Sasha Levin <sashal@kernel.org> | |
| 21 | --- | |
| 22 | drivers/pci/hotplug/rpadlpar_core.c | 4 ++++ | |
| 23 | 1 file changed, 4 insertions(+) | |
| 24 | ||
| 25 | diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c | |
| 26 | index e2356a9c7088..182f9e3443ee 100644 | |
| 27 | --- a/drivers/pci/hotplug/rpadlpar_core.c | |
| 28 | +++ b/drivers/pci/hotplug/rpadlpar_core.c | |
| 29 | @@ -51,6 +51,7 @@ static struct device_node *find_vio_slot_node(char *drc_name) | |
| 30 | if (rc == 0) | |
| 31 | break; | |
| 32 | } | |
| 33 | + of_node_put(parent); | |
| 34 | ||
| 35 | return dn; | |
| 36 | } | |
| 37 | @@ -71,6 +72,7 @@ static struct device_node *find_php_slot_pci_node(char *drc_name, | |
| 38 | return np; | |
| 39 | } | |
| 40 | ||
| 41 | +/* Returns a device_node with its reference count incremented */ | |
| 42 | static struct device_node *find_dlpar_node(char *drc_name, int *node_type) | |
| 43 | { | |
| 44 | struct device_node *dn; | |
| 45 | @@ -306,6 +308,7 @@ int dlpar_add_slot(char *drc_name) | |
| 46 | rc = dlpar_add_phb(drc_name, dn); | |
| 47 | break; | |
| 48 | } | |
| 49 | + of_node_put(dn); | |
| 50 | ||
| 51 | printk(KERN_INFO "%s: slot %s added\n", DLPAR_MODULE_NAME, drc_name); | |
| 52 | exit: | |
| 53 | @@ -439,6 +442,7 @@ int dlpar_remove_slot(char *drc_name) | |
| 54 | rc = dlpar_remove_pci_slot(drc_name, dn); | |
| 55 | break; | |
| 56 | } | |
| 57 | + of_node_put(dn); | |
| 58 | vm_unmap_aliases(); | |
| 59 | ||
| 60 | printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name); | |
| 61 | -- | |
| 62 | 2.20.1 | |
| 63 |