Commit 4bedbbd782eb for kernel

commit 4bedbbd782ebbe7287231fea862c158d4f08a9e3
Author: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Date:   Thu Dec 1 12:01:27 2022 +0800

    iommu/vt-d: Fix PCI device refcount leak in dmar_dev_scope_init()

    for_each_pci_dev() is implemented by pci_get_device(). The comment of
    pci_get_device() says that it will increase the reference count for the
    returned pci_dev and also decrease the reference count for the input
    pci_dev @from if it is not NULL.

    If we break for_each_pci_dev() loop with pdev not NULL, we need to call
    pci_dev_put() to decrease the reference count. Add the missing
    pci_dev_put() for the error path to avoid reference count leak.

    Fixes: 2e4552893038 ("iommu/vt-d: Unify the way to process DMAR device scope array")
    Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
    Link: https://lore.kernel.org/r/20221121113649.190393-3-wangxiongfeng2@huawei.com
    Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 5a8f780e7ffd..bc94059a5b87 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -820,6 +820,7 @@ int __init dmar_dev_scope_init(void)
 			info = dmar_alloc_pci_notify_info(dev,
 					BUS_NOTIFY_ADD_DEVICE);
 			if (!info) {
+				pci_dev_put(dev);
 				return dmar_dev_scope_status;
 			} else {
 				dmar_pci_bus_add_dev(info);