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selinux: fix memleak in security_read_state_kernel() 

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>
This commit is contained in:
Xiu Jianfeng 2022-06-13 21:59:53 +08:00 committed by Paul Moore
parent 8d6d51edcb
commit 73de1befcc
1 changed files with 8 additions and 1 deletions
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9
security/selinux/ss/services.c
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@ -4048,6 +4048,7 @@ 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(
@ -4060,5 +4061,11 @@ 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;
}