HID: hiddev: do cleanup in failure of opening a device

commit 6d4472d7bec39917b54e4e80245784ea5d60ce49 upstream.

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

Reported-by: syzbot <syzbot+62a1e04fd3ec2abf099e@syzkaller.appspotmail.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 0bfc200..8903ea0 100644 (file)
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -330,6 +330,10 @@ static int hiddev_open(struct inode *inode, struct file *file)
        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);