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authorJavi Merino <javi.merino@arm.com>2016-02-11 12:00:51 +0000
committerEduardo Valentin <edubezval@gmail.com>2016-02-11 07:13:29 -0800
commita53b8394ec3c67255928df6ee9cc99dd1cd452e3 (patch)
tree3eaafabc5e9d5644b57b477ef9eb40aafcbf8448 /drivers/thermal
parent26716ce124fce88f288f07738ef685d5dfe5c13f (diff)
thermal: cpu_cooling: fix out of bounds access in time_in_idle
In __cpufreq_cooling_register() we allocate the arrays for time_in_idle and time_in_idle_timestamp to be as big as the number of cpus in this cpufreq device. However, in get_load() we access this array using the cpu number as index, which can result in an out of bound access. Index time_in_idle{,_timestamp} using the index in the cpufreq_device's allowed_cpus mask, as we do for the load_cpu array in cpufreq_get_requested_power() Reported-by: Nicolas Boichat <drinkcat@chromium.org> Cc: Amit Daniel Kachhap <amit.kachhap@gmail.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Tested-by: Nicolas Boichat <drinkcat@chromium.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/cpu_cooling.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c
index e3fbc5a5d88f..6ceac4f2d4b2 100644
--- a/drivers/thermal/cpu_cooling.c
+++ b/drivers/thermal/cpu_cooling.c
@@ -377,26 +377,28 @@ static u32 cpu_power_to_freq(struct cpufreq_cooling_device *cpufreq_device,
* get_load() - get load for a cpu since last updated
* @cpufreq_device: &struct cpufreq_cooling_device for this cpu
* @cpu: cpu number
+ * @cpu_idx: index of the cpu in cpufreq_device->allowed_cpus
*
* Return: The average load of cpu @cpu in percentage since this
* function was last called.
*/
-static u32 get_load(struct cpufreq_cooling_device *cpufreq_device, int cpu)
+static u32 get_load(struct cpufreq_cooling_device *cpufreq_device, int cpu,
+ int cpu_idx)
{
u32 load;
u64 now, now_idle, delta_time, delta_idle;
now_idle = get_cpu_idle_time(cpu, &now, 0);
- delta_idle = now_idle - cpufreq_device->time_in_idle[cpu];
- delta_time = now - cpufreq_device->time_in_idle_timestamp[cpu];
+ delta_idle = now_idle - cpufreq_device->time_in_idle[cpu_idx];
+ delta_time = now - cpufreq_device->time_in_idle_timestamp[cpu_idx];
if (delta_time <= delta_idle)
load = 0;
else
load = div64_u64(100 * (delta_time - delta_idle), delta_time);
- cpufreq_device->time_in_idle[cpu] = now_idle;
- cpufreq_device->time_in_idle_timestamp[cpu] = now;
+ cpufreq_device->time_in_idle[cpu_idx] = now_idle;
+ cpufreq_device->time_in_idle_timestamp[cpu_idx] = now;
return load;
}
@@ -598,7 +600,7 @@ static int cpufreq_get_requested_power(struct thermal_cooling_device *cdev,
u32 load;
if (cpu_online(cpu))
- load = get_load(cpufreq_device, cpu);
+ load = get_load(cpufreq_device, cpu, i);
else
load = 0;