[Lguest] [patch] lguest: dereferencing freed mem in add_eventfd()

[Dan Carpenter]

"new" was freed and then dereferenced.  Also the return value wasn't being 
used so I modified the caller as well.

Compile tested only.  Found by smatch (http://repo.or.cz/w/smatch.git).

regards,
dan carpenter

Signed-off-by: Dan Carpenter <error27 at gmail.com>

--- orig/drivers/lguest/lguest_user.c	2009-07-17 13:52:40.000000000 +0300
+++ new/drivers/lguest/lguest_user.c	2009-07-17 13:55:47.000000000 +0300
@@ -52,8 +52,9 @@
 	new->map[new->num].addr = addr;
 	new->map[new->num].event = eventfd_ctx_fdget(fd);
 	if (IS_ERR(new->map[new->num].event)) {
+		int err =  PTR_ERR(new->map[new->num].event);
 		kfree(new);
-		return PTR_ERR(new->map[new->num].event);
+		return err;
 	}
 	new->num++;
 
@@ -83,7 +84,7 @@
 	err = add_eventfd(lg, addr, fd);
 	mutex_unlock(&lguest_lock);
 
-	return 0;
+	return err;
 }
 
 /*L:050 Sending an interrupt is done by writing LHREQ_IRQ and an interrupt