linux-kernel - [PATCH 1/1] scheduler: access to variable out of scope in sched

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Message-ID: <20090616103512.0c846e51@frequentis.com>
Date:	Tue, 16 Jun 2009 10:35:12 +0200
From:	Christian Engelmayer <christian.engelmayer@...quentis.com>
To:	mingo@...e.hu
Cc:	christian.engelmayer@...quentis.com, linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] scheduler: access to variable out of scope in
 sched_slice()

From: Christian Engelmayer <christian.engelmayer@...quentis.com>

Access to local variable lw is aliased by usage of pointer load. Access to
pointer load in calc_delta_mine() happens when lw is already out of scope.

Signed-off-by: Christian Engelmayer <christian.engelmayer@...quentis.com>
--
Reported by static code analysis. 

--- linux-2.6.30/kernel/sched_fair.c.orig	2009-06-16 10:01:50.000000000 +0200
+++ linux-2.6.30/kernel/sched_fair.c	2009-06-16 10:02:39.000000000 +0200
@@ -430,12 +430,13 @@ static u64 sched_slice(struct cfs_rq *cf
 
 	for_each_sched_entity(se) {
 		struct load_weight *load;
+		struct load_weight lw;
 
 		cfs_rq = cfs_rq_of(se);
 		load = &cfs_rq->load;
 
 		if (unlikely(!se->on_rq)) {
-			struct load_weight lw = cfs_rq->load;
+			lw = cfs_rq->load;
 
 			update_load_add(&lw, se->load.weight);
 			load = &lw;
--
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