linux-kernel - [PATCH 4.19 71/99] selinux: fix GPF on invalid policy

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Date:   Mon, 21 Jan 2019 14:49:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+6664500f0f18f07a5c0e@...kaller.appspotmail.com,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Paul Moore <paul@...l-moore.com>
Subject: [PATCH 4.19 71/99] selinux: fix GPF on invalid policy

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stephen Smalley <sds@...ho.nsa.gov>

commit 5b0e7310a2a33c06edc7eb81ffc521af9b2c5610 upstream.

levdatum->level can be NULL if we encounter an error while loading
the policy during sens_read prior to initializing it.  Make sure
sens_destroy handles that case correctly.

Reported-by: syzbot+6664500f0f18f07a5c0e@...kaller.appspotmail.com
Signed-off-by: Stephen Smalley <sds@...ho.nsa.gov>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/selinux/ss/policydb.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -732,7 +732,8 @@ static int sens_destroy(void *key, void
 	kfree(key);
 	if (datum) {
 		levdatum = datum;
-		ebitmap_destroy(&levdatum->level->cat);
+		if (levdatum->level)
+			ebitmap_destroy(&levdatum->level->cat);
 		kfree(levdatum->level);
 	}
 	kfree(datum);