netdev - Re: [PATCH bpf] bpf: fix cgroup ref leak in cgroup_bpf

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Message-ID: <CAADnVQKQTsjJmYM1Gi-UAnQCS8PChXzwMiSuhY5Ev0HjyX=+Dg@mail.gmail.com>
Date:   Mon, 9 Mar 2020 20:02:19 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Roman Gushchin <guro@...com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf] bpf: fix cgroup ref leak in cgroup_bpf_inherit on out-of-memory

On Mon, Mar 9, 2020 at 3:41 PM Andrii Nakryiko <andriin@...com> wrote:
>
> There is no compensating cgroup_bpf_put() for each ancestor cgroup in
> cgroup_bpf_inherit(). If compute_effective_progs returns error, those cgroups
> won't be freed ever. Fix it by putting them in cleanup code path.
>
> Fixes: e10360f815ca ("bpf: cgroup: prevent out-of-order release of cgroup bpf")
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Applied. Thanks