Revert "fs/9p: fix uaf in in v9fs_stat2inode_dotl"

This reverts commit 11763a8.

This is a requirement to revert commit 724a084 ("fs/9p: simplify
iget to remove unnecessary paths"), see that revert for details.

Fixes: 724a084 ("fs/9p: simplify iget to remove unnecessary paths")
Reported-by: Will Deacon <[email protected]>
Link: https://lkml.kernel.org/r/20240923100508.GA32066@willie-the-truck
Cc: [email protected] # v6.9+
Message-ID: <[email protected]>
Signed-off-by: Dominique Martinet <[email protected]>

Author: martinetd

fs/9p/vfs_inode_dotl.c

@@ -78,11 +78,11 @@ struct inode *v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid)
 
 	retval = v9fs_init_inode(v9ses, inode, &fid->qid,
 				 st->st_mode, new_decode_dev(st->st_rdev));
-	v9fs_stat2inode_dotl(st, inode, 0);
 	kfree(st);
 	if (retval)
 		goto error;
 
+	v9fs_stat2inode_dotl(st, inode, 0);
 	v9fs_set_netfs_context(inode);
 	v9fs_cache_inode_get_cookie(inode);
 	retval = v9fs_get_acl(inode, fid);