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

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Message-ID: <m1mtsgkvik.fsf@fess.ebiederm.org>
Date:   Thu, 27 May 2021 11:10:27 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Alexey Gladkov <legion@...nel.org>
Cc:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] cred: add missing return error code when set_cred_ucounts() failed

Alexey Gladkov <legion@...nel.org> writes:

> On Wed, May 26, 2021 at 05:10:43PM -0500, Eric W. Biederman wrote:
>> 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.
>
> Yes, this is the right fix. I miss it.


Can I have your Acked-by or Reviewed-by.
Thank you.

>> > 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;
>> >  	}
>> 

Eric