linux-kernel - [PATCH AUTOSEL 5.15 42/45] selinux: fix memleak in security_read_state

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Date:   Sun,  7 Aug 2022 21:35:46 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xiu Jianfeng <xiujianfeng@...wei.com>,
        Paul Moore <paul@...l-moore.com>,
        Sasha Levin <sashal@...nel.org>,
        stephen.smalley.work@...il.com, eparis@...isplace.org,
        cgzones@...glemail.com, omosnace@...hat.com,
        michalorzel.eng@...il.com, selinux@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 42/45] selinux: fix memleak in security_read_state_kernel()

From: Xiu Jianfeng <xiujianfeng@...wei.com>

[ Upstream commit 73de1befcc53a7c68b0c5e76b9b5ac41c517760f ]

In this function, it directly returns the result of __security_read_policy
without freeing the allocated memory in *data, cause memory leak issue,
so free the memory if __security_read_policy failed.

Signed-off-by: Xiu Jianfeng <xiujianfeng@...wei.com>
[PM: subject line tweak]
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/selinux/ss/services.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index c4931bf6f92a..e8035e4876df 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -4045,6 +4045,7 @@ int security_read_policy(struct selinux_state *state,
 int security_read_state_kernel(struct selinux_state *state,
 			       void **data, size_t *len)
 {
+	int err;
 	struct selinux_policy *policy;
 
 	policy = rcu_dereference_protected(
@@ -4057,5 +4058,11 @@ int security_read_state_kernel(struct selinux_state *state,
 	if (!*data)
 		return -ENOMEM;
 
-	return __security_read_policy(policy, *data, len);
+	err = __security_read_policy(policy, *data, len);
+	if (err) {
+		vfree(*data);
+		*data = NULL;
+		*len = 0;
+	}
+	return err;
 }
-- 
2.35.1