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    Subject[PATCH 3/8] x86, PCI: Fix memleak with get_current_resources
    Date
    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 res 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 have local info.

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>

    ---
    arch/x86/pci/acpi.c | 49 ++++++++++++++++++++++++++++++-------------------
    1 file changed, 30 insertions(+), 19 deletions(-)

    Index: linux-2.6/arch/x86/pci/acpi.c
    ===================================================================
    --- linux-2.6.orig/arch/x86/pci/acpi.c
    +++ linux-2.6/arch/x86/pci/acpi.c
    @@ -305,49 +305,55 @@ static void add_resources(struct pci_roo
    }
    }

    +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);
    @@ -392,6 +398,7 @@ struct pci_bus * __devinit pci_acpi_scan

    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.
    @@ -405,7 +412,8 @@ struct pci_bus * __devinit pci_acpi_scan
    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
    @@ -419,6 +427,9 @@ struct pci_bus * __devinit pci_acpi_scan
    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,

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