gpio: amd8111: Fix PCI device reference count leak

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: gpio: amd8111: Fix PCI device reference count leak 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() after the 'out' label. Since pci_dev_put() can handle NULL input parameter, there is no problem for the 'Device not found' branch. For the normal path, add pci_dev_put() in amd_gpio_exit().

References

• https://git.kernel.org/stable/c/4749c5cc147c9860b96db1e71cc36d1de1bd3f59
• https://git.kernel.org/stable/c/71d591ef873f9ebb86cd8d053b3caee785b2de6a
• https://git.kernel.org/stable/c/b2bc053ebbba57a06fa655db5ea796de2edce445
• https://git.kernel.org/stable/c/48bd5d3801f6b67cc144449d434abbd5043a6d37
• https://git.kernel.org/stable/c/5ee6413d3dd972930af787b2c0c7aaeb379fa521
• https://git.kernel.org/stable/c/4271515f189bd5fe2ec86b4089dab7cb804625d2
• https://git.kernel.org/stable/c/e364ce04d8f840478b09eee57b614de7cf1e743e
• https://git.kernel.org/stable/c/45fecdb9f658d9c82960c98240bc0770ade19aca