linux-kernel - [PATCH 5.16 0248/1017] KEYS: trusted: Avoid calling null function trusted_key

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Message-Id: <20220405070401.621647117@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:19:21 +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, Dave Kleikamp <dave.kleikamp@...cle.com>,
        Sumit Garg <sumit.garg@...aro.org>,
        James Bottomley <jejb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 0248/1017] KEYS: trusted: Avoid calling null function trusted_key_exit

From: Dave Kleikamp <dave.kleikamp@...cle.com>

[ Upstream commit c5d1ed846e15090bc90dfdaafc07eac066e070bb ]

If one loads and unloads the trusted module, trusted_key_exit can be
NULL. Call it through static_call_cond() to avoid a kernel trap.

Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Cc: Sumit Garg <sumit.garg@...aro.org>
Cc: James Bottomley <jejb@...ux.ibm.com>
Cc: Jarkko Sakkinen <jarkko@...nel.org>
Cc: Mimi Zohar <zohar@...ux.ibm.com>
Cc: David Howells <dhowells@...hat.com>
Cc: James Morris <jmorris@...ei.org>
Cc: "Serge E. Hallyn" <serge@...lyn.com>
Cc: linux-integrity@...r.kernel.org
Cc: keyrings@...r.kernel.org
Cc: linux-security-module@...r.kernel.org
Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/keys/trusted-keys/trusted_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
index 5b35f1b87644..9b9d3ef79cbe 100644
--- a/security/keys/trusted-keys/trusted_core.c
+++ b/security/keys/trusted-keys/trusted_core.c
@@ -351,7 +351,7 @@ static int __init init_trusted(void)
 
 static void __exit cleanup_trusted(void)
 {
-	static_call(trusted_key_exit)();
+	static_call_cond(trusted_key_exit)();
 }
 
 late_initcall(init_trusted);
-- 
2.34.1