ACPICA: fixup after acpi_get_object_info() change
Bjorn Helgaas [Mon, 21 Sep 2009 19:28:49 +0000 (19:28 +0000)]
Commit 15b8dd53f5ffa changed info->hardware_id from a static array to
a pointer.  If hardware_id is non-NULL, it points to a NULL-terminated
string, so we don't need to terminate it explicitly.  However, it may
be NULL; in that case, we *can't* add a NULL terminator.

This causes a NULL pointer dereference oops for devices without _HID.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
CC: Lin Ming <ming.m.lin@intel.com>
CC: Bob Moore <robert.moore@intel.com>
CC: Gary Hade <garyhade@us.ibm.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/pci/hotplug/acpiphp_ibm.c

index a9d926b..e7be66d 100644 (file)
@@ -406,7 +406,6 @@ static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
                        __func__, status);
                return retval;
        }
-       info->hardware_id.string[sizeof(info->hardware_id.length) - 1] = '\0';
 
        if (info->current_status && (info->valid & ACPI_VALID_HID) &&
                        (!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||