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authorViresh Kumar <viresh.kumar@linaro.org>2021-06-18 11:01:27 +0300
committerViresh Kumar <viresh.kumar@linaro.org>2021-07-01 05:02:01 +0300
commitfe2535a44904a77615a3af8e8fd7dafb98fb0e1b (patch)
tree4226c6168a7bcca675f64abef193dc890885173f /drivers/cpufreq/cppc_cpufreq.c
parent9357a380f90a89a168d505561d11f68272e0e768 (diff)
downloadlinux-fe2535a44904a77615a3af8e8fd7dafb98fb0e1b.tar.xz
cpufreq: CPPC: Fix potential memleak in cppc_cpufreq_cpu_init
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> Reviewed-by: Ionela Voinescu <ionela.voinescu@arm.com> Tested-by: Qian Cai <quic_qiancai@quicinc.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/cppc_cpufreq.c')
-rw-r--r--drivers/cpufreq/cppc_cpufreq.c28
1 files 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 @@ out:
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;
}