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Date:   Sun, 8 Sep 2019 23:19:54 +0100
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     =?iso-8859-1?Q?Micka=EBl_Sala=FCn?= <mic@digikod.net>
Cc:     Alexei Starovoitov <alexei.starovoitov@gmail.com>,
        =?iso-8859-1?Q?Micka=EBl_Sala=FCn?= <mickael.salaun@ssi.gouv.fr>,
        linux-kernel@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Casey Schaufler <casey@schaufler-ca.com>,
        Daniel Borkmann <daniel@iogearbox.net>,
        David Drysdale <drysdale@google.com>,
        "David S . Miller" <davem@davemloft.net>,
        "Eric W . Biederman" <ebiederm@xmission.com>,
        James Morris <jmorris@namei.org>, Jann Horn <jann@thejh.net>,
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        Jonathan Corbet <corbet@lwn.net>,
        Kees Cook <keescook@chromium.org>,
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        "Serge E . Hallyn" <serge@hallyn.com>,
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        Stephen Smalley <sds@tycho.nsa.gov>, Tejun Heo <tj@kernel.org>,
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        linux-fsdevel@vger.kernel.org,
        linux-security-module@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH bpf-next v10 06/10] bpf,landlock: Add a new map type:
 inode
Message-ID: <20190908221954.GD1131@ZenIV.linux.org.uk>
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On Mon, Sep 09, 2019 at 12:09:57AM +0200, Micka?l Sala?n wrote:

> >>> +    rcu_read_lock();
> >>> +    ptr = htab_map_lookup_elem(map, &inode);
> >>> +    iput(inode);

Wait a sec.  You are doing _what_ under rcu_read_lock()?

> >>> +    if (IS_ERR(ptr)) {
> >>> +            ret = PTR_ERR(ptr);
> >>> +    } else if (!ptr) {
> >>> +            ret = -ENOENT;
> >>> +    } else {
> >>> +            ret = 0;
> >>> +            copy_map_value(map, value, ptr);
> >>> +    }
> >>> +    rcu_read_unlock();