Comment 1 for bug 994247

My original attempt at fixing this simply converted all of the BUG_ON() calls in ecryptfs_miscdev_*() to if statements that gracefully handled the various conditions. This mostly worked (and will probably be a part of the final solution) except for handling the case where a passed fd was the last one closed. In that situation, ecryptfs_miscdev_release() cannot do its job because we may not be able to look up the daemon with ecryptfs_find_daemon_by_euid() since the current euid may not match the original euid.