linux-kernel - [PATCH 4.19 12/86] drivers/firmware/psci: Fix memory leakage in alloc_init_cpu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200727134914.952600087@linuxfoundation.org>
Date:   Mon, 27 Jul 2020 16:03:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gavin Shan <gshan@...hat.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Will Deacon <will@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 12/86] drivers/firmware/psci: Fix memory leakage in alloc_init_cpu_groups()

From: Gavin Shan <gshan@...hat.com>

[ Upstream commit c377e67c6271954969384f9be1b1b71de13eba30 ]

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@...hat.com>
Reviewed-by: Sudeep Holla <sudeep.holla@....com>
Link: https://lore.kernel.org/r/20200630075227.199624-1-gshan@redhat.com
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/psci_checker.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/psci_checker.c b/drivers/firmware/psci_checker.c
index cbd53cb1b2d47..9f1a913933d53 100644
--- a/drivers/firmware/psci_checker.c
+++ b/drivers/firmware/psci_checker.c
@@ -164,8 +164,10 @@ 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);
 
@@ -174,6 +176,7 @@ 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;
 		}
-- 
2.25.1