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

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Message-ID: <20200309231824.GA66037@carbon.DHCP.thefacebook.com>
Date:   Mon, 9 Mar 2020 16:18:24 -0700
From:   Roman Gushchin <guro@...com>
To:     Andrii Nakryiko <andriin@...com>
CC:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>, <ast@...com>,
        <daniel@...earbox.net>, <andrii.nakryiko@...il.com>,
        <kernel-team@...com>
Subject: Re: [PATCH bpf] bpf: fix cgroup ref leak in cgroup_bpf_inherit on
 out-of-memory

On Mon, Mar 09, 2020 at 03:40:17PM -0700, Andrii Nakryiko 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>

Acked-by: Roman Gushchin <guro@...com>

Thanks, Andrii!