misc: pci_endpoint_test: Avoid issue of interrupts remaining after request_irq error

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: misc: pci_endpoint_test: Avoid issue of interrupts remaining after request_irq error After devm_request_irq() fails with error in pci_endpoint_test_request_irq(), the pci_endpoint_test_free_irq_vectors() is called assuming that all IRQs have been released. However, some requested IRQs remain unreleased, so there are still /proc/irq/* entries remaining, and this results in WARN() with the following message: remove_proc_entry: removing non-empty directory 'irq/30', leaking at least 'pci-endpoint-test.0' WARNING: CPU: 0 PID: 202 at fs/proc/generic.c:719 remove_proc_entry +0x190/0x19c To solve this issue, set the number of remaining IRQs to test->num_irqs, and release IRQs in advance by calling pci_endpoint_test_release_irq(). [kwilczynski: commit log]

References

• https://git.kernel.org/stable/c/705be96504779e4a333ea042b4779ea941f0ace9
• https://git.kernel.org/stable/c/e516e187bf32d8decc7c7d0025ae4857cad13c0e
• https://git.kernel.org/stable/c/54c9f299ad7d7c4be5d271ed12d01a59e95b8907
• https://git.kernel.org/stable/c/9d5118b107b1a2353ed0dff24404aee2e6b7ca0a
• https://git.kernel.org/stable/c/5a4b7181213268c9b07bef8800905528435db44a
• https://git.kernel.org/stable/c/0557e70e2aeba8647bf5a950820b67cfb86533db
• https://git.kernel.org/stable/c/770407f6173f4f39f4e2c1b54422b79ce6c98bdb
• https://git.kernel.org/stable/c/f6cb7828c8e17520d4f5afb416515d3fae1af9a9