[CPUFREQ] Check return value of cpufreq_cpu_get in cpufreq_stats

This fixes an issue found in drivers/cpufreq/cpufreq_stats.c by Coverity.

Error reported:
CID: 2642
Checker: NULL_RETURNS (help)
File: /export2/p4-coverity/mc2/linux26/drivers/cpufreq/cpufreq_stats.c
Function: cpufreq_stats_create_table
Description: Dereferencing NULL value "data"

Patch description:
 The return of cpufreq_cpu_get can be NULL, check return code and return
 -EINVAL if it is NULL.

Signed-off-by: Jayachandran C. <c.jayachandran at gmail.com>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index ff16a87125d9..19b4c3e7c390 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -196,6 +196,11 @@ cpufreq_stats_create_table (struct cpufreq_policy *policy,
                 return -ENOMEM;
 
         data = cpufreq_cpu_get(cpu);
+        if (data == NULL) {
+                ret = -EINVAL;
+                goto error_get_fail;
+        }
+
         if ((ret = sysfs_create_group(&data->kobj, &stats_attr_group)))
                 goto error_out;