linux-kernel - [PATCH] selinux: ensure the policy has been loaded before reading the sidtab stats

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Message-ID: <157714208320.505827.13006028554511851520.stgit@chester>
Date:   Mon, 23 Dec 2019 18:01:23 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     selinux@...r.kernel.org
Cc:     Jeff Vander Stoep <jeffv@...gle.com>, linux-kernel@...r.kernel.org,
        lkp@...ts.01.org
Subject: [PATCH] selinux: ensure the policy has been loaded before reading the
 sidtab stats

Check to make sure we have loaded a policy before we query the
sidtab's hash stats.  Failure to do so could result in a kernel
panic/oops due to a dereferenced NULL pointer.

Fixes: 66f8e2f03c02 ("selinux: sidtab reverse lookup hash table")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
---
 security/selinux/ss/services.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 743b85ede4ef..c9e38f1ede02 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1286,6 +1286,12 @@ int security_sidtab_hash_stats(struct selinux_state *state, char *page)
 {
 	int rc;
 
+	if (!state->initialized) {
+		pr_err("SELinux: %s:  called before initial load_policy\n",
+		       __func__);
+		return -EINVAL;
+	}
+
 	read_lock(&state->ss->policy_rwlock);
 	rc = sidtab_hash_stats(state->ss->sidtab, page);
 	read_unlock(&state->ss->policy_rwlock);