[PATCH 4.14 016/104] fix __legitimize_mnt()/mntput() race

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Al Viro commit 119e1ef80ecfe0d1deb6378d4ab41f5b71519de1 upstream. __legitimize_mnt() has two problems - one is that in case of success the check of mount_lock is not ordered wrt preceding

[PATCH 4.14 016/104] fix __legitimize_mnt()/mntput() race

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Al Viro commit 119e1ef80ecfe0d1deb6378d4ab41f5b71519de1 upstream. __legitimize_mnt() has two problems - one is that in case of success the check of mount_lock is not ordered wrt preceding