Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Justin Tee <justin.tee@broadcom.com>,
        James Smart <jsmart2021@gmail.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 21/37] scsi: lpfc: Fix illegal memory access on Abort IOCBs
Date:   Thu, 20 May 2021 11:22:42 +0200
Message-Id: <20210520092052.975357097@linuxfoundation.org>
In-Reply-To: <20210520092052.265851579@linuxfoundation.org>
References: <20210520092052.265851579@linuxfoundation.org>
User-Agent: quilt/0.66
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: James Smart <jsmart2021@gmail.com>

[ Upstream commit e1364711359f3ced054bda9920477c8bf93b74c5 ]

In devloss timer handler and in backend calls to terminate remote port I/O,
there is logic to walk through all active IOCBs and validate them to
potentially trigger an abort request. This logic is causing illegal memory
accesses which leads to a crash. Abort IOCBs, which may be on the list, do
not have an associated lpfc_io_buf struct. The driver is trying to map an
lpfc_io_buf struct on the IOCB and which results in a bogus address thus
the issue.

Fix by skipping over ABORT IOCBs (CLOSE IOCBs are ABORTS that don't send
ABTS) in the IOCB scan logic.

Link: https://lore.kernel.org/r/20210421234433.102079-1-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_sli.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index ef7cef316d21..795460eda6a5 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -11337,13 +11337,20 @@ lpfc_sli_validate_fcp_iocb(struct lpfc_iocbq *iocbq, struct lpfc_vport *vport,
 			   lpfc_ctx_cmd ctx_cmd)
 {
 	struct lpfc_io_buf *lpfc_cmd;
+	IOCB_t *icmd = NULL;
 	int rc = 1;
 
 	if (iocbq->vport != vport)
 		return rc;
 
-	if (!(iocbq->iocb_flag &  LPFC_IO_FCP) ||
-	    !(iocbq->iocb_flag & LPFC_IO_ON_TXCMPLQ))
+	if (!(iocbq->iocb_flag & LPFC_IO_FCP) ||
+	    !(iocbq->iocb_flag & LPFC_IO_ON_TXCMPLQ) ||
+	      iocbq->iocb_flag & LPFC_DRIVER_ABORTED)
+		return rc;
+
+	icmd = &iocbq->iocb;
+	if (icmd->ulpCommand == CMD_ABORT_XRI_CN ||
+	    icmd->ulpCommand == CMD_CLOSE_XRI_CN)
 		return rc;
 
 	lpfc_cmd = container_of(iocbq, struct lpfc_io_buf, cur_iocbq);
-- 
2.30.2