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HID: logitech-hidpp: disable io in probe error path 

Balance a hid_device_io_start() call with hid_device_io_stop() in the
error path. This avoids processing of HID reports when the probe fails
which possibly leads to invalid memory access in hid_device_probe() as
report_enum->report_id_hash might already be freed via
hid_close_report().

hid_set_drvdata() is called before wtp_allocate, be consistent and clear
drvdata too on the error path of wtp_allocate.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Peter Wu 2014-12-11 13:51:20 +01:00 committed by Jiri Kosina
parent 3a034a7a7d
commit f486d9dbcc
1 changed files with 3 additions and 1 deletions
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4
drivers/hid/hid-logitech-hidpp.c
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@ -1121,7 +1121,7 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP) {
ret = wtp_allocate(hdev, id);
if (ret)
return ret;
goto wtp_allocate_fail;
}
INIT_WORK(&hidpp->work, delayed_work_cb);
@ -1141,6 +1141,7 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (id->group != HID_GROUP_LOGITECH_DJ_DEVICE) {
if (!connected) {
hid_err(hdev, "Device not connected");
hid_device_io_stop(hdev);
goto hid_parse_fail;
}
@ -1186,6 +1187,7 @@ hid_hw_start_fail:
hid_parse_fail:
cancel_work_sync(&hidpp->work);
mutex_destroy(&hidpp->send_mutex);
wtp_allocate_fail:
hid_set_drvdata(hdev, NULL);
return ret;
}