netdev - Re: [PATCH net] sctp: cache netns in sctp_ep

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Message-ID: <20191123182919.310d5bf6@cakuba.netronome.com>
Date:   Sat, 23 Nov 2019 18:29:19 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        davem@...emloft.net,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH net] sctp: cache netns in sctp_ep_common

On Sat, 23 Nov 2019 11:56:49 +0800, Xin Long wrote:
> This patch is to fix a data-race reported by syzbot:
> 
>   BUG: KCSAN: data-race in sctp_assoc_migrate / sctp_hash_obj

> It was caused by rhashtable access asoc->base.sk when sctp_assoc_migrate
> is changing its value. However, what rhashtable wants is netns from asoc
> base.sk, and for an asoc, its netns won't change once set. So we can
> simply fix it by caching netns since created.
> 
> Fixes: d6c0256a60e6 ("sctp: add the rhashtable apis for sctp global transport hashtable")
> Reported-by: syzbot+e3b35fe7918ff0ee474e@...kaller.appspotmail.com
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied, thank you!