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().
Signed-off-by: Mathias Krause <mini...@googlemail.com>
Reported-by: PaX Team <pagee...@freemail.hu>
Cc: sta...@vger.kernel.org # v3.8
---
arch/x86/kernel/apic/apic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index b994cc8..cbf5121 100644
--- 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;
}
--
1.7.10.4
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