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: <ee47c4af-aa4f-3ede-74b9-5d952df2fb1e@fb.com>
Date:   Mon, 20 Jun 2022 11:48:08 -0700
From:   Yonghong Song <yhs@...com>
To:     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>, Hao Luo <haoluo@...gle.com>,
        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>
Cc:     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 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>