From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 16 Sep 2021 16:22:51 +0300
Subject: scsi: lpfc: Fix sprintf() overflow in lpfc_display_fpin_wwpn()
Patch-mainline: v5.15-rc3
Git-commit: cdbc16c552f27ac211a44f9959d813b4f3188223
References: bsc#1190576

This scnprintf() uses the wrong limit.  It should be
"LPFC_FPIN_WWPN_LINE_SZ - len" instead of LPFC_FPIN_WWPN_LINE_SZ.

Link: https://lore.kernel.org/r/20210916132251.GD25094@kili
Fixes: 428569e66fa7 ("scsi: lpfc: Expand FPIN and RDF receive logging")
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/scsi/lpfc/lpfc_els.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -9348,7 +9348,7 @@ lpfc_display_fpin_wwpn(struct lpfc_hba *
 		/* Extract the next WWPN from the payload */
 		wwn = *wwnlist++;
 		wwpn = be64_to_cpu(wwn);
-		len += scnprintf(buf + len, LPFC_FPIN_WWPN_LINE_SZ,
+		len += scnprintf(buf + len, LPFC_FPIN_WWPN_LINE_SZ - len,
 				 " %016llx", wwpn);
 
 		/* Log a message if we are on the last WWPN