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Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 4d31f73e2561..7bdf7907413f 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1886,8 +1886,14 @@ static int do_add_mount(struct mount *newmnt, struct path *path, int mnt_flags)
return err;
err = -EINVAL;
- if (!(mnt_flags & MNT_SHRINKABLE) && !check_mnt(real_mount(path->mnt)))
- goto unlock;
+ if (unlikely(!check_mnt(real_mount(path->mnt)))) {
+ /* that's acceptable only for automounts done in private ns */
+ if (!(mnt_flags & MNT_SHRINKABLE))
+ goto unlock;
+ /* ... and for those we'd better have mountpoint still alive */
+ if (!real_mount(path->mnt)->mnt_ns)
+ goto unlock;
+ }
/* Refuse the same filesystem on the same mount point */
err = -EBUSY;