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>
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index 5bb6f42..38b12e4 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -179,9 +179,6 @@
#define LOGITECH_DJ_INTERFACE_NUMBER 0x02
-#define DJ_DEVICE_INDEX_MIN 1
-#define DJ_DEVICE_INDEX_MAX 6
-
static struct hid_ll_driver logi_dj_ll_driver;
static int logi_dj_output_hidraw_report(struct hid_device *hid, u8 * buf,
@@ -823,7 +820,7 @@
* have finished and no more raw_event callbacks should arrive after
* the remove callback was triggered so no locks are put around the
* code below */
- for (i = 0; i < DJ_MAX_PAIRED_DEVICES; i++) {
+ for (i = 0; i < (DJ_MAX_PAIRED_DEVICES + DJ_DEVICE_INDEX_MIN); i++) {
dj_dev = djrcv_dev->paired_dj_devices[i];
if (dj_dev != NULL) {
hid_destroy_device(dj_dev->hdev);
diff --git a/drivers/hid/hid-logitech-dj.h b/drivers/hid/hid-logitech-dj.h
index 5982263..fd28a5e 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_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;