Re: [PATCH 2/2] iscsi_tcp: disallow binding the same connection twice

[Mike Christie]

On 3/18/24 2:49 PM, Khazhismel Kumykov wrote:
> iscsi_sw_tcp_conn_bind does not check or cleanup previously bound
> sockets, nor should we allow binding the same connection twice.
> 

This looks like a problem for all the iscsi drivers.

I think you could:

1. Add a check for ISCSI_CONN_FLAG_BOUND in iscsi_conn_bind.
2. Have iscsi_sw_tcp_conn_stop do:

        /* stop xmit side */
-       iscsi_suspend_tx(conn);
+       iscsi_conn_unbind(cls_conn, true);

to clear the flag when we clean up the conn for relogin.

3. Fix up the other iscsi drivers so they call:

iscsi_conn_unbind(cls_conn, true);

in their failure paths so when they fail they clear ISCSI_CONN_FLAG_BOUND and
iscsi_conn_bind can be called on the retry.



> Signed-off-by: Khazhismel Kumykov <khazhy@xxxxxxxxxx>
> ---
>  drivers/scsi/iscsi_tcp.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
> index e8ed60b777c6..8cf5dc203a82 100644
> --- a/drivers/scsi/iscsi_tcp.c
> +++ b/drivers/scsi/iscsi_tcp.c
> @@ -716,6 +716,9 @@ iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
>  	struct socket *sock;
>  	int err;
>  
> +	if (tcp_sw_conn->sock)
> +		return -EINVAL;
> +
>  	/* lookup for existing socket */
>  	sock = sockfd_lookup((int)transport_eph, &err);
>  	if (!sock) {