From 83230351c523b04ff8a029a4bdf97d881ecb96fc Mon Sep 17 00:00:00 2001
From: Xiaoke Wang <xkernel.wang@foxmail.com>
Date: Sat, 15 Jan 2022 09:11:11 +0800
Subject: [PATCH] integrity: check the return value of audit_log_start()
Git-commit: 83230351c523b04ff8a029a4bdf97d881ecb96fc
Patch-mainline: v5.17-rc4
References: git-fixes
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@foxmail.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
security/integrity/integrity_audit.c | 2 ++
1 file changed, 2 insertions(+)
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -36,6 +36,8 @@ void integrity_audit_msg(int audit_msgno
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_cred()->uid),