netdev - Re: [PATCH 2/2 net] sctp: fix an error code in sctp_sf_eat

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Message-ID: <CADvbK_f25PEaR1bSuyqeGQsoOp0v1Psaeu2zPhfEi8Zcu-J5Tw@mail.gmail.com>
Date: Fri, 9 Jun 2023 11:13:03 -0400
From: Xin Long <lucien.xin@...il.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Vlad Yasevich <vladislav.yasevich@...com>, 
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org, 
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2 net] sctp: fix an error code in sctp_sf_eat_auth()

On Fri, Jun 9, 2023 at 7:05 AM Dan Carpenter <dan.carpenter@...aro.org> wrote:
>
> The sctp_sf_eat_auth() function is supposed to enum sctp_disposition
> values and returning a kernel error code will cause issues in the
> caller.  Change -ENOMEM to SCTP_DISPOSITION_NOMEM.
>
> Fixes: 65b07e5d0d09 ("[SCTP]: API updates to suport SCTP-AUTH extensions.")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
>  net/sctp/sm_statefuns.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
> index 97f1155a2045..08fdf1251f46 100644
> --- a/net/sctp/sm_statefuns.c
> +++ b/net/sctp/sm_statefuns.c
> @@ -4482,7 +4482,7 @@ enum sctp_disposition sctp_sf_eat_auth(struct net *net,
>                                     SCTP_AUTH_NEW_KEY, GFP_ATOMIC);
>
>                 if (!ev)
> -                       return -ENOMEM;
> +                       return SCTP_DISPOSITION_NOMEM;
>
>                 sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP,
>                                 SCTP_ULPEVENT(ev));
> --
> 2.39.2
>
This one looks good to me.

But for the patch 1/2 (somehow it doesn't show up in my mailbox):

  default:
  pr_err("impossible disposition %d in state %d, event_type %d, event_id %d\n",
        status, state, event_type, subtype.chunk);
- BUG();
+ error = status;
+ if (error >= 0)
+ error = -EINVAL;
+ WARN_ON_ONCE(1);

I think from the sctp_do_sm() perspective, it expects the state_fn
status only from
enum sctp_disposition. It is a BUG to receive any other values and
must be fixed,
as you did in 2/2. It does the same thing as other functions in SCTP code, like
sctp_sf_eat_data_*(), sctp_retransmit() etc.

Thanks.