[PATCH V3.1 1/4] cpufreq: cppc: Fix potential memleak in cppc_cpufreq_cpu_init
From: Viresh Kumar <viresh.kumar@linaro.org>
Date: 2021-06-24 02:10:56
Also in:
lkml
Subsystem:
cpu frequency drivers - cppc cpufreq, cpu frequency scaling framework, the rest · Maintainers:
"Rafael J. Wysocki", Viresh Kumar, Linus Torvalds
It's a classic example of memleak, we allocate something, we fail and
never free the resources.
Make sure we free all resources on policy ->init() failures.
Fixes: a28b2bfc099c ("cppc_cpufreq: replace per-cpu data array with a list")
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
V3->V3.1:
- Updated "if (!ret)" to "if (ret)", the more commonly used format.
drivers/cpufreq/cppc_cpufreq.c | 28 ++++++++++++++++++++--------
1 file changed, 20 insertions(+), 8 deletions(-)
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index be4f62e2c5f1..945ab4942c1c 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c@@ -256,6 +256,16 @@ static struct cppc_cpudata *cppc_cpufreq_get_cpu_data(unsigned int cpu) return NULL; } +static void cppc_cpufreq_put_cpu_data(struct cpufreq_policy *policy) +{ + struct cppc_cpudata *cpu_data = policy->driver_data; + + list_del(&cpu_data->node); + free_cpumask_var(cpu_data->shared_cpu_map); + kfree(cpu_data); + policy->driver_data = NULL; +} + static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy) { unsigned int cpu = policy->cpu;
@@ -309,7 +319,8 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy) default: pr_debug("Unsupported CPU co-ord type: %d\n", policy->shared_type); - return -EFAULT; + ret = -EFAULT; + goto out; } /*
@@ -324,10 +335,16 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy) cpu_data->perf_ctrls.desired_perf = caps->highest_perf; ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls); - if (ret) + if (ret) { pr_debug("Err setting perf value:%d on CPU:%d. ret:%d\n", caps->highest_perf, cpu, ret); + goto out; + } + + return 0; +out: + cppc_cpufreq_put_cpu_data(policy); return ret; }
@@ -345,12 +362,7 @@ static int cppc_cpufreq_cpu_exit(struct cpufreq_policy *policy) pr_debug("Err setting perf value:%d on CPU:%d. ret:%d\n", caps->lowest_perf, cpu, ret); - /* Remove CPU node from list and free driver data for policy */ - free_cpumask_var(cpu_data->shared_cpu_map); - list_del(&cpu_data->node); - kfree(policy->driver_data); - policy->driver_data = NULL; - + cppc_cpufreq_put_cpu_data(policy); return 0; }
--
2.31.1.272.g89b43f80a514