UPSTREAM: HID: core: prevent out-of-bound readings

[firefly-linux-kernel-4.4.55.git] / drivers / hid / hid-core.c

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index ec791e169f8f7c205e1428bc3887ddd2dece043c..936960202cf488dbeff3d31ea5931d04096c10bd 100644 (file)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1251,6 +1251,7 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
                /* Ignore report if ErrorRollOver */
                if (!(field->flags & HID_MAIN_ITEM_VARIABLE) &&
                    value[n] >= min && value[n] <= max &&
+                   value[n] - min < field->maxusage &&
                    field->usage[value[n] - min].hid == HID_UP_KEYBOARD + 1)
                        goto exit;
        }
@@ -1263,11 +1264,13 @@ static void hid_input_field(struct hid_device *hid, struct hid_field *field,
                }
 
                if (field->value[n] >= min && field->value[n] <= max
+                       && field->value[n] - min < field->maxusage
                        && field->usage[field->value[n] - min].hid
                        && search(value, field->value[n], count))
                                hid_process_event(hid, field, &field->usage[field->value[n] - min], 0, interrupt);
 
                if (value[n] >= min && value[n] <= max
+                       && value[n] - min < field->maxusage
                        && field->usage[value[n] - min].hid
                        && search(field->value, value[n], count))
                                hid_process_event(hid, field, &field->usage[value[n] - min], 1, interrupt);