From: Russell Currey <ruscur@xxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 04fec21c06e35b169a83e75a84a015ab4606bf5e upstream.
eeh_pe_bus_get() can return NULL if a PCI bus isn't found for a given PE.
Some callers don't check this, and can cause a null pointer dereference
under certain circumstances.
Fix this by checking NULL everywhere eeh_pe_bus_get() is called.
Fixes: 8a6b1bc70dbb ("powerpc/eeh: EEH core to handle special event")
Signed-off-by: Russell Currey <ruscur@xxxxxxxxxx>
Reviewed-by: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
arch/powerpc/kernel/eeh_driver.c | 8 ++++++++
arch/powerpc/platforms/powernv/eeh-ioda.c | 5 +++++
2 files changed, 13 insertions(+)
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index d3a132c9127c..33d998fda24e 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -697,6 +697,14 @@ static void eeh_handle_special_event(void)
/* Notify all devices to be down */
bus = eeh_pe_bus_get(phb_pe);
+ if (!bus) {
+ pr_err("%s: Cannot find PCI bus for "
+ "PHB#%d-PE#%x\n",
+ __func__,
+ pe->phb->global_number,
+ pe->addr);
+ break;
+ }
eeh_pe_dev_traverse(pe,
eeh_report_failure, NULL);
pcibios_remove_pci_devices(bus);
diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c
index b91083370bc6..605a2f07618e 100644
--- a/arch/powerpc/platforms/powernv/eeh-ioda.c
+++ b/arch/powerpc/platforms/powernv/eeh-ioda.c
@@ -493,6 +493,11 @@ static int ioda_eeh_reset(struct eeh_pe *pe, int option)
ret = ioda_eeh_phb_reset(hose, option);
} else {
bus = eeh_pe_bus_get(pe);
+ if (!bus) {
+ pr_err("%s: Cannot find PCI bus for PHB#%d-PE#%x\n",
+ __func__, pe->phb->global_number, pe->addr);
+ return -EIO;
+ }
if (pci_is_root_bus(bus) ||
pci_is_root_bus(bus->parent))
ret = ioda_eeh_root_reset(hose, option);
--
2.10.2
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