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| author | Russell Currey <ruscur@russell.cc> | 2016-09-12 07:17:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-28 10:45:21 +0300 |
| commit | 99e4d3ddb6782e126a87dfcda48ecd4d1e11cb06 (patch) | |
| tree | 1775f26310275f2db269e607eea8ff11e17a0e5c | |
| parent | 45b2b0cea8e5244e22bfa964625cd6964ef17fec (diff) | |
| download | linux-99e4d3ddb6782e126a87dfcda48ecd4d1e11cb06.tar.xz | |
powerpc/eeh: Null check uses of eeh_pe_bus_get
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@russell.cc>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/powerpc/kernel/eeh_driver.c | 8 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/eeh-powernv.c | 5 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c index 5f36e8a70daa..29aa8d1ce273 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 75363d9374ab..d3354cc4054c 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); |