PCI/AER: Work around use-after-free in pcie_do_fatal_recovery()

When an fatal error is received by a non-bridge device, the device is
removed, and pci_stop_and_remove_bus_device() deallocates the device
structure.  The freed device structure is used by subsequent code to send
uevents and print messages.

Hold a reference on the device until we're finished using it.  This is not
an ideal fix because pcie_do_fatal_recovery() should not use the device at
all after removing it, but that's too big a project for right now.

Fixes: 7e9084b36740 ("PCI/AER: Handle ERR_FATAL with removal and re-enumeration of devices")
Signed-off-by: Thomas Tai <thomas.tai@oracle.com>
[bhelgaas: changelog, reduce get/put coverage]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index f7ce0cb0b0b7..f02e334beb45 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -295,6 +295,7 @@ void pcie_do_fatal_recovery(struct pci_dev *dev, u32 service)
 
         parent = udev->subordinate;
         pci_lock_rescan_remove();
+        pci_dev_get(dev);
         list_for_each_entry_safe_reverse(pdev, temp, &parent->devices,
                                          bus_list) {
                 pci_dev_get(pdev);
@@ -328,6 +329,7 @@ void pcie_do_fatal_recovery(struct pci_dev *dev, u32 service)
                 pci_info(dev, "Device recovery from fatal error failed\n");
         }
 
+        pci_dev_put(dev);
         pci_unlock_rescan_remove();
 }