iommu/vt-d: Fix PCI device refcount leak in dmar_dev_scope_init()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: 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.

References

• https://git.kernel.org/stable/c/d47bc9d7bcdbb9adc9703513d964b514fee5b0bf
• https://git.kernel.org/stable/c/71c4a621985fc051ab86d3a86c749069a993fcb2
• https://git.kernel.org/stable/c/876d7bfb89273997056220029ff12b1c2cc4691d
• https://git.kernel.org/stable/c/cbdd83bd2fd67142b03ce9dbdd1eab322ff7321f
• https://git.kernel.org/stable/c/a5c65cd56aed027f8a97fda8b691caaeb66d115e
• https://git.kernel.org/stable/c/bdb613ef179ad4bb9d56a2533e9b30e434f1dfb7
• https://git.kernel.org/stable/c/2a8f7b90681472948de172dbbf5a54cd342870aa
• https://git.kernel.org/stable/c/4bedbbd782ebbe7287231fea862c158d4f08a9e3