diff options
| -rw-r--r-- | sys/fs/nullfs/null_vfsops.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/fs/nullfs/null_vfsops.c b/sys/fs/nullfs/null_vfsops.c index c3eec727aeea..0ec4f9c87297 100644 --- a/sys/fs/nullfs/null_vfsops.c +++ b/sys/fs/nullfs/null_vfsops.c @@ -152,6 +152,14 @@ nullfs_mount(struct mount *mp) lowerrootvp = ndp->ni_vp; /* + * Do not allow to mount a vnode over itself. + */ + if (mp->mnt_vnodecovered == lowerrootvp) { + vput(lowerrootvp); + return (EDEADLK); + } + + /* * Check multi null mount to avoid `lock against myself' panic. */ if (null_is_nullfs_vnode(mp->mnt_vnodecovered)) { |