audit_get_nd(): don't unlock parent too early

[ Upstream commit 69924b89687a2923e88cc42144aea27868913d0e ]

if the child has been negative and just went positive
under us, we want coherent d_is_positive() and ->d_inode.
Don't unlock the parent until we'd done that work...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 787c7af..4f7262e 100644 (file)
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -366,12 +366,12 @@ static int audit_get_nd(struct audit_watch *watch, struct path *parent)
        struct dentry *d = kern_path_locked(watch->path, parent);
        if (IS_ERR(d))
                return PTR_ERR(d);
-       inode_unlock(d_backing_inode(parent->dentry));
        if (d_is_positive(d)) {
                /* update watch filter fields */
                watch->dev = d->d_sb->s_dev;
                watch->ino = d_backing_inode(d)->i_ino;
        }
+       inode_unlock(d_backing_inode(parent->dentry));
        dput(d);
        return 0;
 }