diff options
| author | Jiri Kosina <jkosina@suse.cz> | 2014-08-21 18:57:17 +0400 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-09-03 12:54:39 +0400 |
| commit | 2ae8a66674a4cd7f2cfee757ee29cb63dce755fe (patch) | |
| tree | 52e42aace508740ea154e8d0560028256a9015d0 | |
| parent | 5d1ab637d00b258f7852c963771ed4f1fd0b2de3 (diff) | |
| download | linux-2ae8a66674a4cd7f2cfee757ee29cb63dce755fe.tar.xz | |
HID: logitech: perform bounds checking on device_id early enough
commit ad3e14d7c5268c2e24477c6ef54bbdf88add5d36 upstream.
device_index is a char type and the size of paired_dj_deivces is 7
elements, therefore proper bounds checking has to be applied to
device_index before it is used.
We are currently performing the bounds checking in
logi_dj_recv_add_djhid_device(), which is too late, as malicious device
could send REPORT_TYPE_NOTIF_DEVICE_UNPAIRED early enough and trigger the
problem in one of the report forwarding functions called from
logi_dj_raw_event().
Fix this by performing the check at the earliest possible ocasion in
logi_dj_raw_event().
Reported-by: Ben Hawkes <hawkes@google.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/hid/hid-logitech-dj.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c index 834cda2c25c7..9bf4c218cac8 100644 --- a/drivers/hid/hid-logitech-dj.c +++ b/drivers/hid/hid-logitech-dj.c @@ -237,13 +237,6 @@ static void logi_dj_recv_add_djhid_device(struct dj_receiver_dev *djrcv_dev, return; } - if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) || - (dj_report->device_index > DJ_DEVICE_INDEX_MAX)) { - dev_err(&djrcv_hdev->dev, "%s: invalid device index:%d\n", - __func__, dj_report->device_index); - return; - } - if (djrcv_dev->paired_dj_devices[dj_report->device_index]) { /* The device is already known. No need to reallocate it. */ dbg_hid("%s: device is already known\n", __func__); @@ -721,6 +714,12 @@ static int logi_dj_raw_event(struct hid_device *hdev, * device (via hid_input_report() ) and return 1 so hid-core does not do * anything else with it. */ + if ((dj_report->device_index < DJ_DEVICE_INDEX_MIN) || + (dj_report->device_index > DJ_DEVICE_INDEX_MAX)) { + dev_err(&hdev->dev, "%s: invalid device index:%d\n", + __func__, dj_report->device_index); + return false; + } spin_lock_irqsave(&djrcv_dev->lock, flags); if (dj_report->report_id == REPORT_ID_DJ_SHORT) { |