linux-kernel - Re: [PATCH bpf-next v2 3/8] bpf, iter: Fix the condition on p when calling stop.

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Message-ID: <CA+khW7jU=Fqt49jxG8y5n2YtRu4_C1gFUW-PqZGY_Rt8PGrGEg@mail.gmail.com>
Date:   Tue, 21 Jun 2022 00:25:55 -0700
From:   Hao Luo <haoluo@...gle.com>
To:     Yonghong Song <yhs@...com>
Cc:     Yosry Ahmed <yosryahmed@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        David Rientjes <rientjes@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH bpf-next v2 3/8] bpf, iter: Fix the condition on p when
 calling stop.

On Mon, Jun 20, 2022 at 11:48 AM Yonghong Song <yhs@...com> wrote:
>
> On 6/10/22 12:44 PM, Yosry Ahmed wrote:
> > From: Hao Luo <haoluo@...gle.com>
> >
> > In bpf_seq_read, seq->op->next() could return an ERR and jump to
> > the label stop. However, the existing code in stop does not handle
> > the case when p (returned from next()) is an ERR. Adds the handling
> > of ERR of p by converting p into an error and jumping to done.
> >
> > Because all the current implementations do not have a case that
> > returns ERR from next(), so this patch doesn't have behavior changes
> > right now.
> >
> > Signed-off-by: Hao Luo <haoluo@...gle.com>
> > Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
>
> Acked-by: Yonghong Song <yhs@...com>

Yonghong, do you want to get this change in now, or you want to wait
for the whole patchset? This fix is straightforward and independent of
other parts. Yosry and I can rebase.