HID: hid-logitech-dj: fix off by one

There is a bug where a device with index 6 would write out of bounds in
the array of paired devices.
This patch fixes that problem.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Olivier Gay <ogay@logitech.com>
Signed-off-by: Nestor Lopez Casado <nlopezcasad@logitech.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/hid/hid-logitech-dj.h b/drivers/hid/hid-logitech-dj.h
index 5982263acd73..fd28a5e0ca3b 100644
--- a/drivers/hid/hid-logitech-dj.h
+++ b/drivers/hid/hid-logitech-dj.h
@@ -27,6 +27,8 @@
 
 #define DJ_MAX_PAIRED_DEVICES                   6
 #define DJ_MAX_NUMBER_NOTIFICATIONS             8
+#define DJ_DEVICE_INDEX_MIN                     1
+#define DJ_DEVICE_INDEX_MAX                     6
 
 #define DJREPORT_SHORT_LENGTH                   15
 #define DJREPORT_LONG_LENGTH                    32
@@ -94,7 +96,8 @@ struct dj_report {
 
 struct dj_receiver_dev {
         struct hid_device *hdev;
-        struct dj_device *paired_dj_devices[DJ_MAX_PAIRED_DEVICES];
+        struct dj_device *paired_dj_devices[DJ_MAX_PAIRED_DEVICES +
+                                            DJ_DEVICE_INDEX_MIN];
         struct work_struct work;
         struct kfifo notif_fifo;
         spinlock_t lock;