From: Sam Bobroff <sbobroff@linux.ibm.com>
Date: Wed, 12 Sep 2018 01:23:21 +0000 (+1000)
Subject: powerpc/eeh: Fix null deref for devices removed during EEH
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=bcbe3730531239abd45ab6c6af4a18078b37dd47;p=openwrt%2Fstaging%2Fblogic.git

powerpc/eeh: Fix null deref for devices removed during EEH

If a device is removed during EEH processing (either by a driver's
handler or as part of recovery), it can lead to a null dereference
in eeh_pe_report_edev().

To handle this, skip devices that have been removed.

Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 67619b4b3f96..4115d353c349 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -281,6 +281,10 @@ static void eeh_pe_report_edev(struct eeh_dev *edev, eeh_report_fn fn,
 	struct pci_driver *driver;
 	enum pci_ers_result new_result;
 
+	if (!edev->pdev) {
+		eeh_edev_info(edev, "no device");
+		return;
+	}
 	device_lock(&edev->pdev->dev);
 	if (eeh_edev_actionable(edev)) {
 		driver = eeh_pcid_get(edev->pdev);