linux-kernel - [PATCH v2] kernel/smp.c: free related resources when failure occurs in hotplug

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Date:	Tue, 09 Jul 2013 08:43:05 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Wang YanQing <udknight@...il.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	lig.fnst@...fujitsu.com, chuansheng.liu@...el.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] kernel/smp.c: free related resources when failure occurs
 in hotplug_cfd()

When failure occurs in hotplug_cfd(), need release related resources,
or will cause memory leak.

Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/smp.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/kernel/smp.c b/kernel/smp.c
index 02a885d..2a3a017 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -49,10 +49,13 @@ hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
 				cpu_to_node(cpu)))
 			return notifier_from_errno(-ENOMEM);
 		if (!zalloc_cpumask_var_node(&cfd->cpumask_ipi, GFP_KERNEL,
-				cpu_to_node(cpu)))
+				cpu_to_node(cpu))) {
+			free_cpumask_var(cfd->cpumask);
 			return notifier_from_errno(-ENOMEM);
+		}
 		cfd->csd = alloc_percpu(struct call_single_data);
 		if (!cfd->csd) {
+			free_cpumask_var(cfd->cpumask_ipi);
 			free_cpumask_var(cfd->cpumask);
 			return notifier_from_errno(-ENOMEM);
 		}
-- 
1.7.7.6
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