linux-kernel - [PATCH] cpupower: Fix segfault due to incorrect getopt

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Date:	Fri, 11 Oct 2013 08:45:51 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Thomas Renninger <trenn@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] cpupower: Fix segfault due to incorrect getopt_long arugments

If a user calls 'cpupower set --perf-bias 15', the process will end with a
SIGSEGV in libc because cpupower-set passes a NULL optarg to the atoi call.
This is because the getopt_long structure currently has all of the options
as having an optional_argument when they really have a required argument.
We change the structure to use required_argument to match the short options
and it resolves the issue.

This fixes https://bugzilla.redhat.com/show_bug.cgi?id=1000439

Cc: stable@...r.kernel.org
Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>
---
 tools/power/cpupower/utils/cpupower-set.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/power/cpupower/utils/cpupower-set.c b/tools/power/cpupower/utils/cpupower-set.c
index dc4de37..bcf1d2f 100644
--- a/tools/power/cpupower/utils/cpupower-set.c
+++ b/tools/power/cpupower/utils/cpupower-set.c
@@ -18,9 +18,9 @@
 #include "helpers/bitmask.h"
 
 static struct option set_opts[] = {
-	{ .name = "perf-bias",	.has_arg = optional_argument,	.flag = NULL,	.val = 'b'},
-	{ .name = "sched-mc",	.has_arg = optional_argument,	.flag = NULL,	.val = 'm'},
-	{ .name = "sched-smt",	.has_arg = optional_argument,	.flag = NULL,	.val = 's'},
+	{ .name = "perf-bias",	.has_arg = required_argument,	.flag = NULL,	.val = 'b'},
+	{ .name = "sched-mc",	.has_arg = required_argument,	.flag = NULL,	.val = 'm'},
+	{ .name = "sched-smt",	.has_arg = required_argument,	.flag = NULL,	.val = 's'},
 	{ },
 };
 
-- 
1.8.3.1

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