HID: fix oops in hid_check_keys_pressed()

If the device is not claimed by hid-input (i.e devices driver by userspace
hiddev/hidraw-based drivers, or completely detached from HID
and driver by libusb), we must not check the hid->inptus, as it
is not guaranteed to be initialized, as this is performed only for devices
handled by hid-input.

Reported-by: Guillaume Chazarain <guichaz@gmail.com>
Tested-by: Guillaume Chazarain <guichaz@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index c7075d2b078..8551693d645 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1825,6 +1825,9 @@ int hid_check_keys_pressed(struct hid_device *hid)
         struct hid_input *hidinput;
         int i;
 
+        if (!(hid->claimed & HID_CLAIMED_INPUT))
+                return 0;
+
         list_for_each_entry(hidinput, &hid->inputs, list) {
                 for (i = 0; i < BITS_TO_LONGS(KEY_MAX); i++)
                         if (hidinput->input->key[i])