[PATCH 1/3] powerpc/eeh: Null check uses of eeh_pe_bus_get

[Russell Currey]

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.

Cc: stable #3.10+
Signed-off-by: Russell Currey <rus...@russell.cc>
---
 arch/powerpc/kernel/eeh_driver.c             | 8 ++++++++
 arch/powerpc/platforms/powernv/eeh-powernv.c | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 5f36e8a..29aa8d1 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -994,6 +994,14 @@ static void eeh_handle_special_event(void)
                                /* Notify all devices to be down */
                                eeh_pe_state_clear(pe, EEH_PE_PRI_BUS);
                                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);
                                pci_hp_remove_devices(bus);
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c 
b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 86544ea..cb08e6a 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -1091,6 +1091,11 @@ static int pnv_eeh_reset(struct eeh_pe *pe, int option)
        }
 
        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 (pe->type & EEH_PE_VF)
                return pnv_eeh_reset_vf_pe(pe, option);
 
-- 
2.9.3