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 dmar_dev_scope_init()
to the 5.10-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-dmar_dev_.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ab880711a1eb1552524aec484e33a48f898fb328
Author: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx>
Date: Thu Dec 1 12:01:27 2022 +0800
iommu/vt-d: Fix PCI device refcount leak in dmar_dev_scope_init()
[ Upstream commit 4bedbbd782ebbe7287231fea862c158d4f08a9e3 ]
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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221121113649.190393-3-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/dmar.c b/drivers/iommu/intel/dmar.c
index 0bc497f4cb9f..a27765a7f6b7 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -816,6 +816,7 @@ 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);
