diff options
| -rw-r--r-- | drivers/hid/usbhid/hiddev.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c index 55b72573066b..c07df8292380 100644 --- a/drivers/hid/usbhid/hiddev.c +++ b/drivers/hid/usbhid/hiddev.c @@ -284,6 +284,14 @@ static int hiddev_open(struct inode *inode, struct file *file) spin_unlock_irq(&list->hiddev->list_lock); mutex_lock(&hiddev->existancelock); + /* + * recheck exist with existance lock held to + * avoid opening a disconnected device + */ + if (!list->hiddev->exist) { + res = -ENODEV; + goto bail_unlock; + } if (!list->hiddev->open++) if (list->hiddev->exist) { struct hid_device *hid = hiddev->hid; |