diff options
| author | Yinghai Lu <yinghai@kernel.org> | 2012-04-02 18:31:53 -0700 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-04-30 13:52:17 -0600 |
| commit | baa495d9de2af97310128bfc0e365a813b63d5bb (patch) | |
| tree | 357ac52e1d76a3a71345e549ef207916f1e53326 /arch/x86/pci | |
| parent | 610929e119b2166167f4f8fce85408472e77a16a (diff) | |
| download | linux-baa495d9de2af97310128bfc0e365a813b63d5bb.tar.bz2 | |
x86/PCI: fix memleak with get_current_resources()
In pci_scan_acpi_root(), when pci_use_crs is set, get_current_resources()
is used to get pci_root_info, and it will allocate name and resource array.
Later if pci_create_root_bus() can not create bus (could be already
there...) it will only free bus res list, but the name and res array is not
freed.
Let get_current_resource() take info pointer instead of using local info.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'arch/x86/pci')
| -rw-r--r-- | arch/x86/pci/acpi.c | 49 |
1 files changed, 30 insertions, 19 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index ed2835e148b5..a99b7d75f5ca 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -315,49 +315,55 @@ static void add_resources(struct pci_root_info *info) } } +static void free_pci_root_info(struct pci_root_info *info) +{ + kfree(info->name); + kfree(info->res); + memset(info, 0, sizeof(struct pci_root_info)); +} + static void -get_current_resources(struct acpi_device *device, int busnum, +get_current_resources(struct pci_root_info *info, + struct acpi_device *device, int busnum, int domain, struct list_head *resources) { - struct pci_root_info info; size_t size; - info.bridge = device; - info.res_num = 0; - info.resources = resources; + info->bridge = device; + info->res_num = 0; + info->resources = resources; acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource, - &info); - if (!info.res_num) + info); + if (!info->res_num) return; - size = sizeof(*info.res) * info.res_num; - info.res = kmalloc(size, GFP_KERNEL); - if (!info.res) + size = sizeof(*info->res) * info->res_num; + info->res = kmalloc(size, GFP_KERNEL); + if (!info->res) return; - info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum); - if (!info.name) + info->name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum); + if (!info->name) goto name_alloc_fail; - info.res_num = 0; + info->res_num = 0; acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource, - &info); + info); if (pci_use_crs) { - add_resources(&info); + add_resources(info); return; } - kfree(info.name); - name_alloc_fail: - kfree(info.res); + free_pci_root_info(info); } struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root) { struct acpi_device *device = root->device; + struct pci_root_info info; int domain = root->segment; int busnum = root->secondary.start; LIST_HEAD(resources); @@ -402,6 +408,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root) sd->domain = domain; sd->node = node; + memset(&info, 0, sizeof(struct pci_root_info)); /* * Maybe the desired pci bus has been already scanned. In such case * it is unnecessary to scan the pci bus with the given domain,busnum. @@ -415,7 +422,8 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root) memcpy(bus->sysdata, sd, sizeof(*sd)); kfree(sd); } else { - get_current_resources(device, busnum, domain, &resources); + get_current_resources(&info, device, busnum, domain, + &resources); /* * _CRS with no apertures is normal, so only fall back to @@ -429,6 +437,9 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root) bus->subordinate = pci_scan_child_bus(bus); else pci_free_resource_list(&resources); + + if (!bus && pci_use_crs) + free_pci_root_info(&info); } /* After the PCI-E bus has been walked and all devices discovered, |