[PATCH AUTOSEL 4.19 034/244] sched/cpufreq: Fix kobject memleak

From: Sasha Levin
Date: Wed May 22 2019 - 15:49:57 EST


From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>

[ Upstream commit 9a4f26cc98d81b67ecc23b890c28e2df324e29f3 ]

Currently the error return path from kobject_init_and_add() is not
followed by a call to kobject_put() - which means we are leaking
the kobject.

Fix it by adding a call to kobject_put() in the error path of
kobject_init_and_add().

Signed-off-by: Tobin C. Harding <tobin@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tobin C. Harding <tobin@xxxxxxxxxx>
Cc: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Cc: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20190430001144.24890-1-tobin@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/cpufreq/cpufreq.c | 1 +
drivers/cpufreq/cpufreq_governor.c | 2 ++
2 files changed, 3 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 505c9a55d5551..d3213594d1a7a 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1103,6 +1103,7 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
cpufreq_global_kobject, "policy%u", cpu);
if (ret) {
pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret);
+ kobject_put(&policy->kobj);
goto err_free_real_cpus;
}

diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 6d53f7d9fc7a9..69fc5cf4782fb 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -459,6 +459,8 @@ int cpufreq_dbs_governor_init(struct cpufreq_policy *policy)
/* Failure, so roll back. */
pr_err("initialization failed (dbs_data kobject init error %d)\n", ret);

+ kobject_put(&dbs_data->attr_set.kobj);
+
policy->governor_data = NULL;

if (!have_governor_per_policy())
--
2.20.1