linux-kernel - [PATCH 4.4 20/22] selinux: fix memory leak in policydb

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Message-Id: <20190805124923.189417648@linuxfoundation.org>
Date:   Mon,  5 Aug 2019 15:02:57 +0200
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+fee3a14d4cdf92646287@...kaller.appspotmail.com,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Paul Moore <paul@...l-moore.com>
Subject: [PATCH 4.4 20/22] selinux: fix memory leak in policydb_init()

From: Ondrej Mosnacek <omosnace@...hat.com>

commit 45385237f65aeee73641f1ef737d7273905a233f upstream.

Since roles_init() adds some entries to the role hash table, we need to
destroy also its keys/values on error, otherwise we get a memory leak in
the error path.

Cc: <stable@...r.kernel.org>
Reported-by: syzbot+fee3a14d4cdf92646287@...kaller.appspotmail.com
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ondrej Mosnacek <omosnace@...hat.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/selinux/ss/policydb.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -266,6 +266,8 @@ static int rangetr_cmp(struct hashtab *h
 	return v;
 }
 
+static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap);
+
 /*
  * Initialize a policy database structure.
  */
@@ -313,8 +315,10 @@ static int policydb_init(struct policydb
 out:
 	hashtab_destroy(p->filename_trans);
 	hashtab_destroy(p->range_tr);
-	for (i = 0; i < SYM_NUM; i++)
+	for (i = 0; i < SYM_NUM; i++) {
+		hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 		hashtab_destroy(p->symtab[i].table);
+	}
 	return rc;
 }