scsi: lpfc: Address NULL pointer dereference after starget_to_rport()

commit 6f808bd78e8296b4ded813b7182988d57e1f6176 upstream.

Calls to starget_to_rport() may return NULL.  Add check for NULL rport
before dereference.

Link: https://lore.kernel.org/r/20220603174329.63777-5-jsmart2021@gmail.com
Fixes: bb21fc9911ee ("scsi: lpfc: Use fc_block_rport()")
Cc: <stable@vger.kernel.org> # v5.18
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index f617a2ef6b0f49d5d023e875ac9ca38f1931c519..add238dc599bc3c958302648ba55d00424f184d2 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -6316,6 +6316,9 @@ lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
        int status;
        u32 logit = LOG_FCP;
 
+       if (!rport)
+               return FAILED;
+
        rdata = rport->dd_data;
        if (!rdata || !rdata->pnode) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,
@@ -6394,6 +6397,9 @@ lpfc_target_reset_handler(struct scsi_cmnd *cmnd)
        unsigned long flags;
        DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waitq);
 
+       if (!rport)
+               return FAILED;
+
        rdata = rport->dd_data;
        if (!rdata || !rdata->pnode) {
                lpfc_printf_vlog(vport, KERN_ERR, LOG_TRACE_EVENT,