# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1278578686 -3600
# Node ID df63728e1680ce7827bd58f6bda453f70ed41ad9
# Parent  a0f0ae5be814f19590d5a59d91ab7183cd1a325f
x86/cpufreq: check array index before use

... rather than after.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

--- a/xen/arch/x86/acpi/cpufreq/cpufreq.c
+++ b/xen/arch/x86/acpi/cpufreq/cpufreq.c
@@ -210,9 +210,11 @@
 
     if (!cpu_isset(cpu, mask))
         cpu = first_cpu(mask);
+    if (cpu >= NR_CPUS)
+        return 0;
+
     policy = cpufreq_cpu_policy[cpu];
-
-    if (cpu >= NR_CPUS || !policy || !drv_data[policy->cpu])
+    if (!policy || !drv_data[policy->cpu])
         return 0;    
 
     switch (drv_data[policy->cpu]->cpu_feature) {