linux-kernel - [ 22/77] x86/apic: Fix parsing of the lapic cmdline option

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Date:	Fri,  1 Mar 2013 11:44:07 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, PaX Team <pageexec@...email.hu>,
	Mathias Krause <minipli@...glemail.com>,
	David Rientjes <rientjes@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [ 22/77] x86/apic: Fix parsing of the lapic cmdline option

3.8-stable review patch.  If anyone has any objections, please let me know.

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

From: Mathias Krause <minipli@...glemail.com>

commit 27cf929845b10043f2257693c7d179a9e0b1980e upstream.

Including " lapic " in the kernel cmdline on an x86-64 kernel
makes it panic while parsing early params -- e.g. with no user
visible output.

Fix this bug by ensuring arg is non-NULL before passing it to
strncmp().

Reported-by: PaX Team <pageexec@...email.hu>
Signed-off-by: Mathias Krause <minipli@...glemail.com>
Acked-by: David Rientjes <rientjes@...gle.com>
Cc: Suresh Siddha <suresh.b.siddha@...el.com>
Link: http://lkml.kernel.org/r/1361303227-13174-1-git-send-email-minipli@googlemail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/kernel/apic/apic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -131,7 +131,7 @@ static int __init parse_lapic(char *arg)
 {
 	if (config_enabled(CONFIG_X86_32) && !arg)
 		force_enable_local_apic = 1;
-	else if (!strncmp(arg, "notscdeadline", 13))
+	else if (arg && !strncmp(arg, "notscdeadline", 13))
 		setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER);
 	return 0;
 }


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