xenbus_xs.c: use-after-free

The Coverity checker spotted the following use-after-free in drivers/xen/xenbus/xenbus_xs.c:

<-- snip -->

...
static int process_msg(void)
{
...

                if (IS_ERR(msg->u.watch.vec)) {
                        kfree(msg);
                        err = PTR_ERR(msg->u.watch.vec);

...

<-- snip -->

cu
Adrian

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

This patch fixes an obvious use-after-free spotted by the Coverity checker.

---

@@ -782,8 +782,8 @@ static int process_msg(void)
 		msg->u.watch.vec = split(body, msg->hdr.len,
 					 &msg->u.watch.vec_size);
 		if (IS_ERR(msg->u.watch.vec)) {
-			kfree(msg);
 			err = PTR_ERR(msg->u.watch.vec);
+			kfree(msg);
 			goto out;
 		}
 

OK, thanks.

J