linux-kernel - Re: [PATCH -next] cred: add missing return error code when set_cred

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Date:   Wed, 26 May 2021 17:10:43 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     <linux-kernel@...r.kernel.org>, <legion@...nel.org>
Subject: Re: [PATCH -next] cred: add missing return error code when set_cred_ucounts() failed

Yang Yingliang <yangyingliang@...wei.com> writes:

> If set_cred_ucounts() failed, we need return the error code.

Alex how does this look to you?

This is showing up now as I have finally dropped the code in linux-next
and other people are looking at it.

At a quick fix looks correct to me.

> Fixes: 905ae01c4ae2 ("Add a reference to ucounts for each cred")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  kernel/cred.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/cred.c b/kernel/cred.c
> index db7c46bf36e5..e6fd2b3fc31f 100644
> --- a/kernel/cred.c
> +++ b/kernel/cred.c
> @@ -372,7 +372,8 @@ int copy_creds(struct task_struct *p, unsigned long clone_flags)
>  		ret = create_user_ns(new);
>  		if (ret < 0)
>  			goto error_put;
> -		if (set_cred_ucounts(new) < 0)
> +		ret = set_cred_ucounts(new);
> +		if (ret < 0)
>  			goto error_put;
>  	}