linux-kernel - Re: [PATCH] scsi: qla4xxx: fix a potential NULL pointer dereference

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Date:   Sat, 23 Mar 2019 17:39:57 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Kangjie Lu <kjlu@....edu>, QLogic-Storage-Upstream@...gic.com,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: qla4xxx: fix a potential NULL pointer dereference


On 3/14/19 1:30 AM, Kangjie Lu wrote:
> In case iscsi_lookup_endpoint fails, the fix returns -EINVAL to
> avoid NULL pointer dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  drivers/scsi/qla4xxx/ql4_os.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
> index a77bfb224248..80289c885c07 100644
> --- a/drivers/scsi/qla4xxx/ql4_os.c
> +++ b/drivers/scsi/qla4xxx/ql4_os.c
> @@ -3203,6 +3203,8 @@ static int qla4xxx_conn_bind(struct iscsi_cls_session *cls_session,
>  	if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
>  		return -EINVAL;
>  	ep = iscsi_lookup_endpoint(transport_fd);
> +	if (!ep)
> +		return -EINVAL;
>  	conn = cls_conn->dd_data;
>  	qla_conn = conn->dd_data;
>  	qla_conn->qla_ep = ep->dd_data;
Gentle reminder, could someone please review this ?