ocfs2: check existence of old dentry in ocfs2_link()

System call linkat first calls user_path_at(), check the existence of
old dentry, and then calls vfs_link()->ocfs2_link() to do the actual
work.  There may exist a race when Node A create a hard link for file
while node B rm it.

         Node A                          Node B
user_path_at()
  ->ocfs2_lookup(),
find old dentry exist
                                rm file, add inode say inodeA
                                to orphan_dir

call ocfs2_link(),create a
hard link for inodeA.

                                rm the link, add inodeA to orphan_dir
                                again

When orphan_scan work start, it calls ocfs2_queue_orphans() to do the
main work.  It first tranverses entrys in orphan_dir, linking all inodes
in this orphan_dir to a list look like this:

	inodeA->inodeB->...->inodeA

When tranvering this list, it will fall into loop, calling iput() again
and again.  And finally trigger BUG_ON(inode->i_state & I_CLEAR).

Signed-off-by: joyce <xuejiufei@huawei.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index f4d609be9400..3683643f3f0e 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -664,6 +664,7 @@ static int ocfs2_link(struct dentry *old_dentry,
         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
         struct ocfs2_dir_lookup_result lookup = { NULL, };
         sigset_t oldset;
+        u64 old_de_ino;
 
         trace_ocfs2_link((unsigned long long)OCFS2_I(inode)->ip_blkno,
                          old_dentry->d_name.len, old_dentry->d_name.name,
@@ -686,6 +687,22 @@ static int ocfs2_link(struct dentry *old_dentry,
                 goto out;
         }
 
+        err = ocfs2_lookup_ino_from_name(dir, old_dentry->d_name.name,
+                        old_dentry->d_name.len, &old_de_ino);
+        if (err) {
+                err = -ENOENT;
+                goto out;
+        }
+
+        /*
+         * Check whether another node removed the source inode while we
+         * were in the vfs.
+         */
+        if (old_de_ino != OCFS2_I(inode)->ip_blkno) {
+                err = -ENOENT;
+                goto out;
+        }
+
         err = ocfs2_check_dir_for_entry(dir, dentry->d_name.name,
                                         dentry->d_name.len);
         if (err)