From: Xiongfeng Wang Date: Thu, 1 Dec 2022 04:01:27 +0000 (+0800) Subject: iommu/vt-d: Fix PCI device refcount leak in dmar_dev_scope_init() X-Git-Tag: baikal/aarch64/sdk5.9~915 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=7c02b2fe241e2d8d3073582205232c8fb842dfea;p=kernel.git 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: 6abf2db1f901 ("iommu/vt-d: Unify the way to process DMAR device scope array") Signed-off-by: Xiongfeng Wang Link: https://lore.kernel.org/r/20221121113649.190393-3-wangxiongfeng2@huawei.com Signed-off-by: Lu Baolu Signed-off-by: Joerg Roedel Signed-off-by: Sasha Levin --- diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 9f881fc102f73..36900d65386fc 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -794,6 +794,7 @@ 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);