linux-kernel - Re: [PATCHv2] integrity: check the return value of audit_log

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Message-ID: <CAHC9VhQDEG7hOwAzTCkaiO7r7sgaV2B08BVV6V3XMVLZztcS+g@mail.gmail.com>
Date:   Fri, 14 Jan 2022 17:13:02 -0500
From:   Paul Moore <paul@...l-moore.com>
To:     xkernel.wang@...mail.com
Cc:     jmorris@...ei.org, serge@...lyn.com,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] integrity: check the return value of audit_log_start()

On Thu, Jan 13, 2022 at 11:24 PM <xkernel.wang@...mail.com> wrote:
>
> 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: simplify the patch.
> Note: Take the suggestion from Paul Moore.
>  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()),
> --

-- 
paul moore
www.paul-moore.com