[PATCH AUTOSEL 5.18 50/53] selinux: fix memleak in security_read_state_kernel()

[PATCH AUTOSEL 5.18 50/53] selinux: fix memleak in security_read_state_kernel()

[Sasha Levin]

From: Xiu Jianfeng <xiujianfeng@huawei.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@huawei.com>
[PM: subject line tweak]
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 6901dc07680d..cad54f454d01 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -4049,6 +4049,7 @@ 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(
@@ -4061,5 +4062,11 @@ 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

[PATCH AUTOSEL 5.18 51/53] selinux: Add boundary check in put_entry()

[Sasha Levin]

From: Xiu Jianfeng <xiujianfeng@huawei.com>

[ Upstream commit 15ec76fb29be31df2bccb30fc09875274cba2776 ]

Just like next_entry(), boundary check is necessary to prevent memory
out-of-bound access.

Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 security/selinux/ss/policydb.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h
index c24d4e1063ea..ffc4e7bad205 100644
--- a/security/selinux/ss/policydb.h
+++ b/security/selinux/ss/policydb.h
@@ -370,6 +370,8 @@ static inline int put_entry(const void *buf, size_t bytes, int num, struct polic
 {
 	size_t len = bytes * num;
 
+	if (len > fp->len)
+		return -EINVAL;
 	memcpy(fp->data, buf, len);
 	fp->data += len;
 	fp->len -= len;
-- 
2.35.1