[PATCH 4.17 15/97] fix mntput/mntput race

4.17-stable review patch. If anyone has any objections, please let me know. -- From: Al Viro commit 9ea0a46ca2c318fcc449c1e6b62a7230a17888f1 upstream. mntput_no_expire() does the calculation of total refcount under mount_lock; unfortunately, the decrement (as well as all

[PATCH 4.17 15/97] fix mntput/mntput race

4.17-stable review patch. If anyone has any objections, please let me know. -- From: Al Viro commit 9ea0a46ca2c318fcc449c1e6b62a7230a17888f1 upstream. mntput_no_expire() does the calculation of total refcount under mount_lock; unfortunately, the decrement (as well as all