This is a note to let you know that I've just added the patch titled
iommu/vt-d: Fix PCI device refcount leak in has_external_pci()
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-vt-d-fix-pci-device-refcount-leak-in-has_exter.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 90897a7c53d24bec9408648da2a1f98d8d5717e1
Author: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx>
Date: Thu Dec 1 12:01:26 2022 +0800
iommu/vt-d: Fix PCI device refcount leak in has_external_pci()
[ Upstream commit afca9e19cc720bfafc75dc5ce429c185ca93f31d ]
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() before 'return true' to avoid reference count leak.
Fixes: 89a6079df791 ("iommu/vt-d: Force IOMMU on for platform opt in hint")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221121113649.190393-2-wangxiongfeng2@xxxxxxxxxx
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index e47700674978..412b106d2a39 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3844,8 +3844,10 @@ static inline bool has_external_pci(void)
struct pci_dev *pdev = NULL;
for_each_pci_dev(pdev)
- if (pdev->external_facing)
+ if (pdev->external_facing) {
+ pci_dev_put(pdev);
return true;
+ }
return false;
}
