From: Gavin Shan <gshan@redhat.com>
To: linux-arm-kernel@lists.infradead.org
Cc: mark.rutland@arm.com, catalin.marinas@arm.com, will@kernel.org,
sudeep.holla@arm.com
Subject: [PATCH v3] drivers/firmware/psci: Fix memory leakage in alloc_init_cpu_groups()
Date: Tue, 30 Jun 2020 17:52:27 +1000 [thread overview]
Message-ID: <20200630075227.199624-1-gshan@redhat.com> (raw)
The CPU mask (@tmp) should be released on failing to allocate
@cpu_groups or any of its elements. Otherwise, it leads to memory
leakage because the CPU mask variable is dynamically allocated
when CONFIG_CPUMASK_OFFSTACK is enabled.
Signed-off-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
---
v3: Pick r-b from Sudeep and rebases to 5.8.rc3
---
drivers/firmware/psci/psci_checker.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/psci/psci_checker.c b/drivers/firmware/psci/psci_checker.c
index 873841af8d57..d9b1a2d71223 100644
--- a/drivers/firmware/psci/psci_checker.c
+++ b/drivers/firmware/psci/psci_checker.c
@@ -157,8 +157,10 @@ static int alloc_init_cpu_groups(cpumask_var_t **pcpu_groups)
cpu_groups = kcalloc(nb_available_cpus, sizeof(cpu_groups),
GFP_KERNEL);
- if (!cpu_groups)
+ if (!cpu_groups) {
+ free_cpumask_var(tmp);
return -ENOMEM;
+ }
cpumask_copy(tmp, cpu_online_mask);
@@ -167,6 +169,7 @@ static int alloc_init_cpu_groups(cpumask_var_t **pcpu_groups)
topology_core_cpumask(cpumask_any(tmp));
if (!alloc_cpumask_var(&cpu_groups[num_groups], GFP_KERNEL)) {
+ free_cpumask_var(tmp);
free_cpu_groups(num_groups, &cpu_groups);
return -ENOMEM;
}
--
2.23.0
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next reply other threads:[~2020-06-30 7:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-30 7:52 Gavin Shan [this message]
2020-07-08 22:02 ` [PATCH v3] drivers/firmware/psci: Fix memory leakage in alloc_init_cpu_groups() Will Deacon
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