Fix invalid dentry when race in mkdir between two clients

fs/cifs/CHANGES

@@ -2,7 +2,8 @@ Verison 0.95
 ------------
 Fix unsafe global variable usage and password hash failure on gcc 3.3.1
 Fix problem reconnecting secondary mounts to same server after session 
-failure.
+failure.  Fix invalid dentry - race in mkdir when directory gets created
+by another client between the lookup and mkdir.
  
 Version 0.94
 ------------

fs/cifs/inode.c

@@ -426,6 +426,7 @@ cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
 	rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls);
 	if (rc) {
 		cFYI(1, ("cifs_mkdir returned 0x%x ", rc));
+		d_drop(direntry);
 	} else {
 		inode->i_nlink++;
 		if (pTcon->ses->capabilities & CAP_UNIX)