linux-kernel - [PATCH 4.9 01/34] integrity: check the return value of audit_log

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Message-Id: <20220214092445.995230860@linuxfoundation.org>
Date:   Mon, 14 Feb 2022 10:25:27 +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, Xiaoke Wang <xkernel.wang@...mail.com>,
        Paul Moore <paul@...l-moore.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: [PATCH 4.9 01/34] integrity: check the return value of audit_log_start()

From: Xiaoke Wang <xkernel.wang@...mail.com>

commit 83230351c523b04ff8a029a4bdf97d881ecb96fc upstream.

audit_log_start() returns audit_buffer pointer on success or NULL on
error, so it is better to check the return value of it.

Fixes: 3323eec921ef ("integrity: IMA as an integrity service provider")
Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
Cc: <stable@...r.kernel.org>
Reviewed-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 security/integrity/integrity_audit.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -39,6 +39,8 @@ void integrity_audit_msg(int audit_msgno
 		return;
 
 	ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
+	if (!ab)
+		return;
 	audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
 			 task_pid_nr(current),
 			 from_kuid(&init_user_ns, current_cred()->uid),