[PATCH 4.4 40/78] HID: hiddev: do cleanup in failure of opening a device

[Greg Kroah-Hartman]

From: Hillf Danton <hdan...@sina.com>

commit 6d4472d7bec39917b54e4e80245784ea5d60ce49 upstream.

Undo what we did for opening before releasing the memory slice.

Reported-by: syzbot <syzbot+62a1e04fd3ec2abf0...@syzkaller.appspotmail.com>
Cc: Andrey Konovalov <andreyk...@google.com>
Signed-off-by: Hillf Danton <hdan...@sina.com>
Signed-off-by: Jiri Kosina <jkos...@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/hid/usbhid/hiddev.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -330,6 +330,10 @@ static int hiddev_open(struct inode *ino
        return 0;
 bail_unlock:
        mutex_unlock(&hiddev->existancelock);
+
+       spin_lock_irq(&list->hiddev->list_lock);
+       list_del(&list->node);
+       spin_unlock_irq(&list->hiddev->list_lock);
 bail:
        file->private_data = NULL;
        vfree(list);