linux-kernel - Re: [PATCH net 2/2] rxrpc: Fix rxrpc_local leak in rxrpc_lookup

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Message-ID: <CAB9dFdsfEV9UFC-4vJ6QXdLV03FYK7N-QJAu84etqouOV8YMkw@mail.gmail.com>
Date:   Tue, 23 Nov 2021 10:11:41 -0400
From:   Marc Dionne <marc.dionne@...istor.com>
To:     Eiichi Tsukata <eiichi.tsukata@...anix.com>
Cc:     David Howells <dhowells@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-afs@...ts.infradead.org, netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 2/2] rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()

On Sun, Nov 21, 2021 at 12:17 AM Eiichi Tsukata
<eiichi.tsukata@...anix.com> wrote:
>
> Need to call rxrpc_put_local() for peer candidate before kfree() as it
> holds a ref to rxrpc_local.
>
> Fixes: 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record")
> Signed-off-by: Eiichi Tsukata <eiichi.tsukata@...anix.com>
> ---
>  net/rxrpc/peer_object.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c
> index 68396d052052..431b62bc1da2 100644
> --- a/net/rxrpc/peer_object.c
> +++ b/net/rxrpc/peer_object.c
> @@ -364,10 +364,12 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *rx,
>
>                 spin_unlock_bh(&rxnet->peer_hash_lock);
>
> -               if (peer)
> +               if (peer) {
> +                       rxrpc_put_local(candidate->local);
>                         kfree(candidate);
> -               else
> +               } else {
>                         peer = candidate;
> +               }
>         }
>
>         _net("PEER %d {%pISp}", peer->debug_id, &peer->srx.transport);
> --
> 2.33.1

Reviewed-by: Marc Dionne <marc.dionne@...istor.com>

Marc