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

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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>
This commit is contained in:
Nestor Lopez Casado 2011-09-20 15:59:03 +02:00 committed by Jiri Kosina
parent 534a7b8e10
commit 844580ff63
2 changed files with 5 additions and 5 deletions
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5
drivers/hid/hid-logitech-dj.c
View file

@ -179,9 +179,6 @@ static const u8 hid_reportid_size_map[NUMBER_OF_HID_REPORTS] = {
#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 @@ static void logi_dj_remove(struct hid_device *hdev)
* 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);

5
drivers/hid/hid-logitech-dj.h
View file

@ -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;