From:   Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
To:     Paul Moore <paul@paul-moore.com>,
        Roberto Sassu <roberto.sassu@huawei.com>,
        linux-kernel@vger.kernel.org
Cc:     Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mimi Zohar <zohar@linux.ibm.com>,
        =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= <linux@weissschuh.net>,
        Casey Schaufler <casey@schaufler-ca.com>,
        =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>,
        =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= <mic@digikod.net>,
        Frederick Lawler <fred@cloudflare.com>
Subject: [PATCH v1 2/2] integrity: Add the release() hook to the integrity LSM module
Date:   Sat, 11 Mar 2023 00:11:10 +0100
Message-Id: <20230310231107.10954-2-mirsad.todorovac@alu.unizg.hr>
In-Reply-To: <20230310231107.10954-1-mirsad.todorovac@alu.unizg.hr>
References: <20230310231107.10954-1-mirsad.todorovac@alu.unizg.hr>
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The kmem_cache_create() callback in the init() hook of the integrity LSM
module doesn't have a corresponding kmem_cache_destroy() function call.

The allocated cache is destroyed on kernel shutdown in an undefined manner.

This patch should define a proper destructor to deallocate resource in a
well-behaved, defined order.

Signed-off-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mimi Zohar <zohar@linux.ibm.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Thomas Weißschuh <linux@weissschuh.net>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: Christian Göttsche <cgzones@googlemail.com>
Cc: Mickaël Salaün <mic@digikod.net>
Cc: Frederick Lawler <fred@cloudflare.com>

---
 security/integrity/iint.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index 8638976f7990..3f69eb702b2e 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -179,9 +179,16 @@ static int __init integrity_iintcache_init(void)
 			      0, SLAB_PANIC, init_once);
 	return 0;
 }
+
+static int __exit integrity_iintcache_release(void)
+{
+	kmem_cache_destroy(iint_cache);
+}
+
 DEFINE_LSM(integrity) = {
 	.name = "integrity",
 	.init = integrity_iintcache_init,
+	.release = integrity_iintcache_release,
 };
 
 
-- 
2.30.2