linux-kernel - Re: [PATCH 1/3] scsi: libiscsi: move init ehwait to iscsi_session

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Date:   Fri, 10 Sep 2021 11:25:26 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     Ding Hui <dinghui@...gfor.com.cn>, lduncan@...e.com,
        cleech@...hat.com, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        open-iscsi@...glegroups.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] scsi: libiscsi: move init ehwait to
 iscsi_session_setup()

On 9/9/21 8:02 PM, Ding Hui wrote:
> commit ec29d0ac29be ("scsi: iscsi: Fix conn use after free during
> resets") move member ehwait from conn to session, but left init ehwait
> in iscsi_conn_setup().
> 
> Due to one session can be binded by multi conns, the conn after the

A session can only have 1 conn. There is some code that makes it look
like we can do multiple conns or swap the single conn, but it was never
fully implemented/supported upstream.

However, I like the patch. The init should be done in iscsi_session_setup,
so could you fix up the commit, so it's correct?

> first will reinit the session->ehwait, move init ehwait to
> iscsi_session_setup() to fix it.
> 
> Fixes: ec29d0ac29be ("scsi: iscsi: Fix conn use after free during resets")
> Signed-off-by: Ding Hui <dinghui@...gfor.com.cn>
> ---
>  drivers/scsi/libiscsi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
> index 4683c183e9d4..712a45368385 100644
> --- a/drivers/scsi/libiscsi.c
> +++ b/drivers/scsi/libiscsi.c
> @@ -2947,6 +2947,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
>  	session->tmf_state = TMF_INITIAL;
>  	timer_setup(&session->tmf_timer, iscsi_tmf_timedout, 0);
>  	mutex_init(&session->eh_mutex);
> +	init_waitqueue_head(&session->ehwait);
>  
>  	spin_lock_init(&session->frwd_lock);
>  	spin_lock_init(&session->back_lock);
> @@ -3074,8 +3075,6 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
>  		goto login_task_data_alloc_fail;
>  	conn->login_task->data = conn->data = data;
>  
> -	init_waitqueue_head(&session->ehwait);
> -
>  	return cls_conn;
>  
>  login_task_data_alloc_fail:
>