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hfs: don't allow mounting over .../rsrc

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That's one case when unlink() destroys a subtree, thanks to "resource
fork" idiocy.  We might forcibly evict that shit on unlink(2), but
for now let's just disallow overmounting; as it is, anything that
plays games with those would leak mounts.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-04-30 19:52:18 -04:00
parent 6b9cceead0
commit 0e5c56fd07
1 changed files with 1 additions and 0 deletions
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fs/hfs/inode.c
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@ -543,6 +543,7 @@ static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
igrab(dir);
hlist_add_fake(&inode->i_hash);
mark_inode_dirty(inode);
dont_mount(dentry);
out:
return d_splice_alias(inode, dentry);
}