scsi: lpfc: Protect memory leak for NPIV ports sending PLOGI_RJT

[ Upstream commit 672d1cb ]

There is a potential memory leak in lpfc_ignore_els_cmpl() and
lpfc_els_rsp_reject() that was allocated from NPIV PLOGI_RJT
(lpfc_rcv_plogi()'s login_mbox).

Check if cmdiocb->context_un.mbox was allocated in lpfc_ignore_els_cmpl(),
and then free it back to phba->mbox_mem_pool along with mbox->ctx_buf for
service parameters.

For lpfc_els_rsp_reject() failure, free both the ctx_buf for service
parameters and the login_mbox.

Link: https://lore.kernel.org/r/20220412222008.126521-10-jsmart2021@gmail.com
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: Sasha Levin <sashal@kernel.org>

drivers/scsi/lpfc/lpfc_nportdisc.c

@@ -614,9 +614,15 @@ lpfc_rcv_plogi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
 		stat.un.b.lsRjtRsnCode = LSRJT_INVALID_CMD;
 		stat.un.b.lsRjtRsnCodeExp = LSEXP_NOTHING_MORE;
 		rc = lpfc_els_rsp_reject(vport, stat.un.lsRjtError, cmdiocb,
-			ndlp, login_mbox);
-		if (rc)
+					 ndlp, login_mbox);
+		if (rc) {
+			mp = (struct lpfc_dmabuf *)login_mbox->ctx_buf;
+			if (mp) {
+				lpfc_mbuf_free(phba, mp->virt, mp->phys);
+				kfree(mp);
+			}
 			mempool_free(login_mbox, phba->mbox_mem_pool);
+		}
 		return 1;
 	}
 

drivers/scsi/lpfc/lpfc_sli.c

@@ -12066,6 +12066,8 @@ lpfc_ignore_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 {
 	struct lpfc_nodelist *ndlp = NULL;
 	IOCB_t *irsp;
+	LPFC_MBOXQ_t *mbox;
+	struct lpfc_dmabuf *mp;
 	u32 ulp_command, ulp_status, ulp_word4, iotag;
 
 	ulp_command = get_job_cmnd(phba, cmdiocb);
@@ -12077,6 +12079,21 @@ lpfc_ignore_els_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 	} else {
 		irsp = &rspiocb->iocb;
 		iotag = irsp->ulpIoTag;
+
+		/* It is possible a PLOGI_RJT for NPIV ports to get aborted.
+		 * The MBX_REG_LOGIN64 mbox command is freed back to the
+		 * mbox_mem_pool here.
+		 */
+		if (cmdiocb->context_un.mbox) {
+			mbox = cmdiocb->context_un.mbox;
+			mp = (struct lpfc_dmabuf *)mbox->ctx_buf;
+			if (mp) {
+				lpfc_mbuf_free(phba, mp->virt, mp->phys);
+				kfree(mp);
+			}
+			mempool_free(mbox, phba->mbox_mem_pool);
+			cmdiocb->context_un.mbox = NULL;
+		}
 	}
 
 	/* ELS cmd tag <ulpIoTag> completes */