iommu/vt-d: Fix PCI device refcount leak in dmar_dev_scope_init()
authorXiongfeng Wang <wangxiongfeng2@huawei.com>
Thu, 1 Dec 2022 04:01:27 +0000 (12:01 +0800)
committerJoerg Roedel <jroedel@suse.de>
Fri, 2 Dec 2022 10:45:33 +0000 (11:45 +0100)
commit4bedbbd782ebbe7287231fea862c158d4f08a9e3
treee29f3c7bdff76e49762be071a55cad97f9c40383
parentafca9e19cc720bfafc75dc5ce429c185ca93f31d
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>
drivers/iommu/intel/dmar.c