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Subject[PATCH v3] cpufreq/pasemi: fix an use-after-free in pas_cpufreq_cpu_init()
Date
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.yang99@zte.com.cn>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
v3: fix a leaked reference.
v2: clean up the code according to the advice of viresh.

drivers/cpufreq/pasemi-cpufreq.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/pasemi-cpufreq.c b/drivers/cpufreq/pasemi-cpufreq.c
index 6b1e4ab..9dc5163 100644
--- a/drivers/cpufreq/pasemi-cpufreq.c
+++ b/drivers/cpufreq/pasemi-cpufreq.c
@@ -128,20 +128,20 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
int cur_astate, idx;
struct resource res;
struct device_node *cpu, *dn;
- int err = -ENODEV;
+ int err;

cpu = of_get_cpu_node(policy->cpu, NULL);
-
- of_node_put(cpu);
if (!cpu)
- goto out;
+ return -ENODEV;

dn = of_find_compatible_node(NULL, NULL, "1682m-sdc");
if (!dn)
dn = of_find_compatible_node(NULL, NULL,
"pasemi,pwrficient-sdc");
- if (!dn)
+ if (!dn) {
+ err = -ENODEV;
goto out;
+ }
err = of_address_to_resource(dn, 0, &res);
of_node_put(dn);
if (err)
@@ -196,6 +196,7 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
policy->cur = pas_freqs[cur_astate].frequency;
ppc_proc_freq = policy->cur * 1000ul;

+ of_node_put(cpu);
return cpufreq_generic_init(policy, pas_freqs, get_gizmo_latency());

out_unmap_sdcpwr:
@@ -204,6 +205,7 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
out_unmap_sdcasr:
iounmap(sdcasr_mapbase);
out:
+ of_node_put(cpu);
return err;
}

--
2.9.5
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