linux-kernel - Re: [PATCH] iscsi_tcp: fix the NULL pointer dereference

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Message-ID: <CAHckoCxCRZXXcSp3A+i+vxzM8AomDtAohVYDy1FmARJzB2SrCQ@mail.gmail.com>
Date:   Mon, 11 Oct 2021 10:03:49 +0800
From:   Li Feng <fengli@...rtx.com>
To:     michael.christie@...cle.com
Cc:     Lee Duncan <lduncan@...e.com>, Chris Leech <cleech@...hat.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "open list:ISCSI" <open-iscsi@...glegroups.com>,
        "open list:ISCSI" <linux-scsi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Gulam Mohamed <gulam.mohamed@...cle.com>
Subject: Re: [PATCH] iscsi_tcp: fix the NULL pointer dereference

Thanks,
Feng Li

<michael.christie@...cle.com> 于2021年10月11日周一 上午12:05写道：
>
> On 10/10/21 2:19 AM, Li Feng wrote:
> >  drivers/scsi/iscsi_tcp.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
> > index 1bc37593c88f..2ec1405d272d 100644
> > --- a/drivers/scsi/iscsi_tcp.c
> > +++ b/drivers/scsi/iscsi_tcp.c
> > @@ -724,6 +724,8 @@ static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
> >               break;
> >       case ISCSI_PARAM_DATADGST_EN:
> >               iscsi_set_param(cls_conn, param, buf, buflen);
> > +             if (!tcp_sw_conn || !tcp_sw_conn->sock)
> > +                     return -ENOTCONN;
> >               tcp_sw_conn->sendpage = conn->datadgst_en ?
> >                       sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
> >               break;
> >
>
> Hi,
>
> Thanks for the patch. This was supposed to be fixed in:
>
> commit 9e67600ed6b8565da4b85698ec659b5879a6c1c6
> Author: Gulam Mohamed <gulam.mohamed@...cle.com>
> Date:   Thu Mar 25 09:32:48 2021 +0000
>
>     scsi: iscsi: Fix race condition between login and sync thread
>
> because it was not supposed to allow set_param to be called on
> an unbound connection. However, it looks like there was a mistake in
> the patch:
>
>                 err = transport->set_param(conn, ev->u.set_param.param,
>                                            data, ev->u.set_param.len);
> +               if ((conn->state == ISCSI_CONN_BOUND) ||
> +                       (conn->state == ISCSI_CONN_UP)) {
> +                       err = transport->set_param(conn, ev->u.set_param.param,
> +                                       data, ev->u.set_param.len);
> +               } else {
> +                       return -ENOTCONN;
> +               }
>
>
> and that first set_param call was supposed to be deleted and
> replaced with the one that was added in the conn->state check.
>
> We should just need a patch to remove that first set_param call.

Yes, I have checked the upstream code, this is an obvious mistake here.
I encountered this issue on 5.11.12-300.fc34.x86_64, it doesn't
include this patch,
so I check the pointer like my patch.
Thanks.