From 8ad08d8a0c3823e9b06ef84c362c9361be323d2d Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 16 Jan 2010 12:56:08 -0500 Subject: [PATCH] may_umount() needs namespace_sem otherwise it races with clone_mnt() changing mnt_share/mnt_slaves Signed-off-by: Al Viro --- fs/namespace.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/namespace.c b/fs/namespace.c index 7d70d63ceb29..461090a57b33 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -965,10 +965,12 @@ EXPORT_SYMBOL(may_umount_tree); int may_umount(struct vfsmount *mnt) { int ret = 1; + down_read(&namespace_sem); spin_lock(&vfsmount_lock); if (propagate_mount_busy(mnt, 2)) ret = 0; spin_unlock(&vfsmount_lock); + up_read(&namespace_sem); return ret; } -- 2.20.1