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| author | Bjorn Helgaas | 2012-06-21 00:18:29 +0200 |
|---|---|---|
| committer | Bjorn Helgaas | 2012-06-21 01:28:53 +0200 |
| commit | dfb117b3e50c52c7b3416db4a4569224b8db80bb (patch) | |
| tree | 902d330744008f0ff902ff27aa5a50b39eb28dd7 /drivers/pci | |
| parent | PCI: shpchp: remove dead code (diff) | |
| download | kernel-qcow2-linux-dfb117b3e50c52c7b3416db4a4569224b8db80bb.tar.gz kernel-qcow2-linux-dfb117b3e50c52c7b3416db4a4569224b8db80bb.tar.xz kernel-qcow2-linux-dfb117b3e50c52c7b3416db4a4569224b8db80bb.zip | |
PCI: acpiphp: check whether _ADR evaluation succeeded
Check whether we evaluated _ADR successfully. Previously we ignored
failure, so we would have used garbage data from the stack as the device
and function number.
We return AE_OK so that we ignore only this slot and continue looking
for other slots.
Found by Coverity (CID 113981).
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/hotplug/acpiphp_glue.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 806c44fa645a..09bf37721842 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -132,6 +132,15 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle)) return AE_OK; + status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); + if (ACPI_FAILURE(status)) { + warn("can't evaluate _ADR (%#x)\n", status); + return AE_OK; + } + + device = (adr >> 16) & 0xffff; + function = adr & 0xffff; + pdev = pbus->self; if (pdev && pci_is_pcie(pdev)) { tmp = acpi_find_root_bridge_handle(pdev); @@ -144,10 +153,6 @@ register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) } } - acpi_evaluate_integer(handle, "_ADR", NULL, &adr); - device = (adr >> 16) & 0xffff; - function = adr & 0xffff; - newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL); if (!newfunc) return AE_NO_MEMORY; |