From: Javed Hasan <jhasan@marvell.com>
Date: Tue, 15 Jun 2021 09:59:39 -0700
Subject: scsi: libfc: Fix array index out of bound exception
Patch-mainline: v5.14-rc1
Git-commit: b27c4577557045f1ab3cdfeabfc7f3cd24aca1fe
References: bsc#1188616

Fix array index out of bound exception in fc_rport_prli_resp().

Link: https://lore.kernel.org/r/20210615165939.24327-1-jhasan@marvell.com
Signed-off-by: Javed Hasan <jhasan@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/scsi/libfc/fc_rport.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/scsi/libfc/fc_rport.c
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -1173,6 +1173,7 @@ static void fc_rport_prli_resp(struct fc
 		resp_code = (pp->spp.spp_flags & FC_SPP_RESP_MASK);
 		FC_RPORT_DBG(rdata, "PRLI spp_flags = 0x%x spp_type 0x%x\n",
 			     pp->spp.spp_flags, pp->spp.spp_type);
+
 		rdata->spp_type = pp->spp.spp_type;
 		if (resp_code != FC_SPP_RESP_ACK) {
 			if (resp_code == FC_SPP_RESP_CONF)
@@ -1195,11 +1196,13 @@ static void fc_rport_prli_resp(struct fc
 		/*
 		 * Call prli provider if we should act as a target
 		 */
-		prov = fc_passive_prov[rdata->spp_type];
-		if (prov) {
-			memset(&temp_spp, 0, sizeof(temp_spp));
-			prov->prli(rdata, pp->prli.prli_spp_len,
-				   &pp->spp, &temp_spp);
+		if (rdata->spp_type < FC_FC4_PROV_SIZE) {
+			prov = fc_passive_prov[rdata->spp_type];
+			if (prov) {
+				memset(&temp_spp, 0, sizeof(temp_spp));
+				prov->prli(rdata, pp->prli.prli_spp_len,
+					   &pp->spp, &temp_spp);
+			}
 		}
 		/*
 		 * Check if the image pair could be established