linux-kernel - [PATCH 1/2] ARM: cpuidle: fix !cpuidle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 24 Mar 2016 13:11:08 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<linux@....linux.org.uk>, <daniel.lezcano@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH 1/2] ARM: cpuidle: fix !cpuidle_ops[cpu].init case during init

Let's assume cpuidle_ops exists but it doesn't implement the according
init member, current arm_cpuidle_init() will return success to its
caller, but in fact it should return -EOPNOTSUPP.

Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
---
 arch/arm/kernel/cpuidle.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm/kernel/cpuidle.c b/arch/arm/kernel/cpuidle.c
index 703926e..f108d8f 100644
--- a/arch/arm/kernel/cpuidle.c
+++ b/arch/arm/kernel/cpuidle.c
@@ -143,8 +143,12 @@ int __init arm_cpuidle_init(int cpu)
 		return -ENODEV;
 
 	ret = arm_cpuidle_read_ops(cpu_node, cpu);
-	if (!ret && cpuidle_ops[cpu].init)
-		ret = cpuidle_ops[cpu].init(cpu_node, cpu);
+	if (!ret) {
+		if (cpuidle_ops[cpu].init)
+			ret = cpuidle_ops[cpu].init(cpu_node, cpu);
+		else
+			ret = -EOPNOTSUPP;
+	}
 
 	of_node_put(cpu_node);
 
-- 
2.8.0.rc3