[PATCH] cpufreq/pasemi: fix an use-after-free in pas_cpufreq_cpu_init()

[Wen Yang]

The cpu variable is still being used in the of_get_property() call
after the of_node_put() call, which may result in use-after-free.

Fixes: a9acc26b75f ("cpufreq/pasemi: fix possible object reference leak")
Signed-off-by: Wen Yang <wen.yan...@zte.com.cn>
Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
Cc: Viresh Kumar <viresh.ku...@linaro.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux...@vger.kernel.org
Cc: linux-ker...@vger.kernel.org
---
 drivers/cpufreq/pasemi-cpufreq.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/cpufreq/pasemi-cpufreq.c b/drivers/cpufreq/pasemi-cpufreq.c
index 6b1e4ab..d2dd47b 100644
--- a/drivers/cpufreq/pasemi-cpufreq.c
+++ b/drivers/cpufreq/pasemi-cpufreq.c
@@ -132,7 +132,6 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy 
*policy)
 
        cpu = of_get_cpu_node(policy->cpu, NULL);
 
-       of_node_put(cpu);
        if (!cpu)
                goto out;
 
@@ -141,15 +140,15 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy 
*policy)
                dn = of_find_compatible_node(NULL, NULL,
                                             "pasemi,pwrficient-sdc");
        if (!dn)
-               goto out;
+               goto out_put_cpu_node;
        err = of_address_to_resource(dn, 0, &res);
        of_node_put(dn);
        if (err)
-               goto out;
+               goto out_put_cpu_node;
        sdcasr_mapbase = ioremap(res.start + SDCASR_OFFSET, 0x2000);
        if (!sdcasr_mapbase) {
                err = -EINVAL;
-               goto out;
+               goto out_put_cpu_node;
        }
 
        dn = of_find_compatible_node(NULL, NULL, "1682m-gizmo");
@@ -177,6 +176,7 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy 
*policy)
                err = -EINVAL;
                goto out_unmap_sdcpwr;
        }
+       of_node_put(cpu);
 
        /* we need the freq in kHz */
        max_freq = *max_freqp / 1000;
@@ -203,6 +203,8 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy 
*policy)
 
 out_unmap_sdcasr:
        iounmap(sdcasr_mapbase);
+out_put_cpu_node:
+       of_node_put(cpu);
 out:
        return err;
 }
-- 
2.9.5