linux-kernel - Re: [PATCH] scsi: mpt3sas: fix NULL pointer access in mpt3sas_transport_port

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Message-ID: <CAFdVvOwxxvMGNTS9KQ-N-Q_Xo3+qKA64ok=2sv-FYmnerzwfGQ@mail.gmail.com>
Date:   Tue, 7 Mar 2023 09:53:35 -0700
From:   Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>
To:     Wenchao Hao <haowenchao2@...wei.com>
Cc:     Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linfeilong@...wei.com
Subject: Re: [PATCH] scsi: mpt3sas: fix NULL pointer access in mpt3sas_transport_port_add()

On Sat, Feb 25, 2023 at 3:02 AM Wenchao Hao <haowenchao2@...wei.com> wrote:
>
> port is allocated by sas_port_alloc_num() and rphy is allocated by
> sas_end_device_alloc() or sas_expander_alloc() which may return NULL,
> so we need to check the rphy to avoid possible NULL pointer access.
>
> If sas_rphy_add() called with failure rphy is set to NULL, we would
> access the rphy in next lines which would also result NULL pointer
> access.
>
> Fix commit 78316e9dfc24 ("scsi: mpt3sas: Fix possible resource leaks
> in mpt3sas_transport_port_add()")
>
> Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
Acked-by: Sathya Prakash Veerichetty <sathya.prakash@...adcom.com>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_transport.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_transport.c b/drivers/scsi/mpt3sas/mpt3sas_transport.c
> index e5ecd6ada6cd..e8a4750f6ec4 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_transport.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_transport.c
> @@ -785,7 +785,7 @@ mpt3sas_transport_port_add(struct MPT3SAS_ADAPTER *ioc, u16 handle,
>                 goto out_fail;
>         }
>         port = sas_port_alloc_num(sas_node->parent_dev);
> -       if ((sas_port_add(port))) {
> +       if (!port || (sas_port_add(port))) {
>                 ioc_err(ioc, "failure at %s:%d/%s()!\n",
>                         __FILE__, __LINE__, __func__);
>                 goto out_fail;
> @@ -824,6 +824,12 @@ mpt3sas_transport_port_add(struct MPT3SAS_ADAPTER *ioc, u16 handle,
>                             mpt3sas_port->remote_identify.sas_address;
>         }
>
> +       if (!rphy) {
> +               ioc_err(ioc, "failure at %s:%d/%s()!\n",
> +                       __FILE__, __LINE__, __func__);
> +               goto out_delete_port;
> +       }
> +
>         rphy->identify = mpt3sas_port->remote_identify;
>
>         if ((sas_rphy_add(rphy))) {
> @@ -831,6 +837,7 @@ mpt3sas_transport_port_add(struct MPT3SAS_ADAPTER *ioc, u16 handle,
>                         __FILE__, __LINE__, __func__);
>                 sas_rphy_free(rphy);
>                 rphy = NULL;
> +               goto out_delete_port;
>         }
>
>         if (mpt3sas_port->remote_identify.device_type == SAS_END_DEVICE) {
> @@ -857,7 +864,10 @@ mpt3sas_transport_port_add(struct MPT3SAS_ADAPTER *ioc, u16 handle,
>                     rphy_to_expander_device(rphy), hba_port->port_id);
>         return mpt3sas_port;
>
> - out_fail:
> +out_delete_port:
> +       sas_port_delete(port);
> +
> +out_fail:
>         list_for_each_entry_safe(mpt3sas_phy, next, &mpt3sas_port->phy_list,
>             port_siblings)
>                 list_del(&mpt3sas_phy->port_siblings);
> --
> 2.32.0
>

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