[PATCH] ptrace: mm_need_new_owner: use ->real_parent to search inthe siblings

[Oleg Nesterov]

"Search in the siblings" should use ->real_parent, not ->parent. If the
task is traced then ->parent == tracer, while the task's parent is always
->real_parent.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

--- PTRACE/kernel/exit.c~	2009-04-09 00:39:10.000000000 +0200
+++ PTRACE/kernel/exit.c	2009-04-23 23:08:37.000000000 +0200
@@ -590,7 +590,7 @@ retry:
 	/*
 	 * Search in the siblings
 	 */
-	list_for_each_entry(c, &p->parent->children, sibling) {
+	list_for_each_entry(c, &p->real_parent->children, sibling) {
 		if (c->mm == mm)
 			goto assign_new_owner;
 	}

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