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]

https://git.kernel.org/stable/c/0557e70e2aeba8647bf5a950820b67cfb86533db

https://git.kernel.org/stable/c/5a4b7181213268c9b07bef8800905528435db44a

https://git.kernel.org/stable/c/770407f6173f4f39f4e2c1b54422b79ce6c98bdb

https://git.kernel.org/stable/c/9d5118b107b1a2353ed0dff24404aee2e6b7ca0a

https://git.kernel.org/stable/c/f6cb7828c8e17520d4f5afb416515d3fae1af9a9