[PATCH 4.2 166/258] thermal: cpu_cooling: free power table on error or when unregistering

From: Greg Kroah-Hartman
Date: Sun Oct 18 2015 - 00:24:48 EST


4.2-stable review patch. If anyone has any objections, please let me know.

------------------

From: Javi Merino <javi.merino@xxxxxxx>

commit eba4f88d5af84e0fcaa5d6eb4fe35a75c47203cb upstream.

The power table is not being freed on error from cpufreq_cooling
register or when unregistering. Free it.

Fixes: c36cf0717631 ("thermal: cpu_cooling: implement the power cooling device API")
Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: Eduardo Valentin <edubezval@xxxxxxxxx>
Signed-off-by: Javi Merino <javi.merino@xxxxxxx>
Signed-off-by: Eduardo Valentin <edubezval@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/thermal/cpu_cooling.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)

--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -272,7 +272,7 @@ static int build_dyn_power_table(struct
struct power_table *power_table;
struct dev_pm_opp *opp;
struct device *dev = NULL;
- int num_opps = 0, cpu, i;
+ int num_opps = 0, cpu, i, ret = 0;
unsigned long freq;

for_each_cpu(cpu, &cpufreq_device->allowed_cpus) {
@@ -307,7 +307,8 @@ static int build_dyn_power_table(struct

if (i >= num_opps) {
rcu_read_unlock();
- return -EAGAIN;
+ ret = -EAGAIN;
+ goto free_power_table;
}

freq_mhz = freq / 1000000;
@@ -329,14 +330,21 @@ static int build_dyn_power_table(struct

rcu_read_unlock();

- if (i != num_opps)
- return PTR_ERR(opp);
+ if (i != num_opps) {
+ ret = PTR_ERR(opp);
+ goto free_power_table;
+ }

cpufreq_device->cpu_dev = dev;
cpufreq_device->dyn_power_table = power_table;
cpufreq_device->dyn_power_table_entries = i;

return 0;
+
+free_power_table:
+ kfree(power_table);
+
+ return ret;
}

static u32 cpu_freq_to_power(struct cpufreq_cooling_device *cpufreq_device,
@@ -846,7 +854,7 @@ __cpufreq_cooling_register(struct device
ret = get_idr(&cpufreq_idr, &cpufreq_dev->id);
if (ret) {
cool_dev = ERR_PTR(ret);
- goto free_table;
+ goto free_power_table;
}

snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
@@ -888,6 +896,8 @@ __cpufreq_cooling_register(struct device

remove_idr:
release_idr(&cpufreq_idr, cpufreq_dev->id);
+free_power_table:
+ kfree(cpufreq_dev->dyn_power_table);
free_table:
kfree(cpufreq_dev->freq_table);
free_time_in_idle_timestamp:
@@ -1038,6 +1048,7 @@ void cpufreq_cooling_unregister(struct t

thermal_cooling_device_unregister(cpufreq_dev->cool_dev);
release_idr(&cpufreq_idr, cpufreq_dev->id);
+ kfree(cpufreq_dev->dyn_power_table);
kfree(cpufreq_dev->time_in_idle_timestamp);
kfree(cpufreq_dev->time_in_idle);
kfree(cpufreq_dev->freq_table);


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