scsi: lpfc: Fix illegal memory access on Abort IOCBs

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>

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 06ccc01..579ac75 100644 (file)
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -11804,13 +11804,20 @@ 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 || 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);