linux-kernel - [PATCH 3.2 51/79] cpupower: Fix segfault due to incorrect getopt

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Message-ID: <lsq.1392192612.821204399@decadent.org.uk>
Date:	Wed, 12 Feb 2014 08:10:12 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Dominik Brodowski" <linux@...inikbrodowski.net>,
	"Josh Boyer" <jwboyer@...hat.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Josh Boyer" <jwboyer@...oraproject.org>,
	"Thomas Renninger" <trenn@...e.de>
Subject: [PATCH 3.2 51/79] cpupower: Fix segfault due to incorrect
 getopt_long arugments

3.2.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Josh Boyer <jwboyer@...hat.com>

commit f447ef4a56dee4b68a91460bcdfe06b5011085f2 upstream.

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

Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>
Cc: Dominik Brodowski <linux@...inikbrodowski.net>
Cc: Thomas Renninger <trenn@...e.de>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 tools/power/cpupower/utils/cpupower-set.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- 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'},
 	{ },
 };
 

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