commit f41a52d3010579949a3b9fd76783120d9643b60b
Author: Rafi Rubin <rafi@seas.upenn.edu>
Date:   Tue Mar 8 00:24:29 2011 -0500

    HID: ntrig don't dereference unclaimed hidinput
    
    Check before dereferencing field->hidinput to fix a reported invalid
    deference bug.
    
    Signed-off-by: Rafi Rubin <rafi@seas.upenn.edu>
    Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-ntrig.c b/drivers/hid/hid-ntrig.c
index beb4034..a93e58c 100644
--- a/drivers/hid/hid-ntrig.c
+++ b/drivers/hid/hid-ntrig.c
@@ -539,8 +539,19 @@ static int ntrig_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 static int ntrig_event (struct hid_device *hid, struct hid_field *field,
 			struct hid_usage *usage, __s32 value)
 {
-	struct input_dev *input = field->hidinput->input;
 	struct ntrig_data *nd = hid_get_drvdata(hid);
+	struct input_dev *input;
+
+	/* Skip processing if not a claimed input */
+	if (!(hid->claimed & HID_CLAIMED_INPUT))
+		goto not_claimed_input;
+
+	/* This function is being called before the structures are fully
+	 * initialized */
+	if(!(field->hidinput && field->hidinput->input))
+		return -EINVAL;
+
+	input = field->hidinput->input;
 
 	/* No special handling needed for the pen */
 	if (field->application == HID_DG_PEN)
@@ -810,6 +821,8 @@ static int ntrig_event (struct hid_device *hid, struct hid_field *field,
 		}
 	}
 
+not_claimed_input:
+
 	/* we have handled the hidinput part, now remains hiddev */
 	if ((hid->claimed & HID_CLAIMED_HIDDEV) && hid->hiddev_hid_event)
 		hid->hiddev_hid_event(hid, field, usage, value);