linux-kernel - [PATCH v3] integrity: check the return value of audit_log

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Message-ID: <tencent_46E8FF37413C984772AD382429DAC2719409@qq.com>
Date:   Sat, 15 Jan 2022 09:11:11 +0800
From:   xkernel.wang@...mail.com
To:     paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com
Cc:     linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Xiaoke Wang <xkernel.wang@...mail.com>
Subject: [PATCH v3] integrity: check the return value of audit_log_start()

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

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

Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
Reviewed-by: Paul Moore <paul@...l-moore.com>
---
Changelogs:
V2 -> V3: add the Reviewed-by tag.
V1 -> V2: simplify the patch. 
 security/integrity/integrity_audit.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
index 2922005..0ec5e4c 100644
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -45,6 +45,8 @@ void integrity_audit_message(int audit_msgno, struct inode *inode,
 		return;
 
 	ab = audit_log_start(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_uid()),
--