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misc: pci_endpoint_test: Free IRQs before removing the device

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In pci_endpoint_test_remove(), freeing the IRQs after removing the device
creates a small race window for IRQs to be received with the test device
memory already released, causing the IRQ handler to access invalid memory,
resulting in an oops.

Free the device IRQs before removing the device to avoid this issue.

Link: https://lore.kernel.org/r/20230415023542.77601-15-dlemoal@kernel.org
Fixes: e03327122e ("pci_endpoint_test: Add 2 ioctl commands")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Damien Le Moal 2023-04-15 11:35:39 +09:00 committed by Bjorn Helgaas
parent 1754dfd2e7
commit f61b7634a3
1 changed files with 3 additions and 3 deletions
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6
drivers/misc/pci_endpoint_test.c
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@ -938,6 +938,9 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
if (id < 0)
return;
pci_endpoint_test_release_irq(test);
pci_endpoint_test_free_irq_vectors(test);
misc_deregister(&test->miscdev);
kfree(misc_device->name);
kfree(test->name);
@ -947,9 +950,6 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
pci_iounmap(pdev, test->bar[bar]);
}
pci_endpoint_test_release_irq(test);
pci_endpoint_test_free_irq_vectors(test);
pci_release_regions(pdev);
pci_disable_device(pdev);
}