From: Xiongfeng Wang wangxiongfeng2@huawei.com
stable inclusion from stable-v4.19.268 commit 876d7bfb89273997056220029ff12b1c2cc4691d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYRE3 CVE: CVE-2022-49002
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ 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@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 Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Guo Mengqi guomengqi3@huawei.com --- drivers/iommu/dmar.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 187812e35c99..6d608f71867c 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -806,6 +806,7 @@ 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);