From: Karsten Graul <kgraul@linux.ibm.com>
Date: Tue, 12 Feb 2019 16:29:55 +0100
Subject: net/smc: check port_idx of ib event
Git-commit: 81cf6430526531bc688d4c3d09506dba7b456fb1
Patch-mainline: v5.1-rc1
References: bsc#1129857 bsc#1129861 LTC#176247 LTC#176250

For robustness protect of higher port numbers than expected to avoid
setting bits behind our port_event_mask. In case of an DEVICE_FATAL
event all ports must be checked. The IB_EVENT_GID_CHANGE event is
provided in the global event handler, so handle it there. And handle a
QP_FATAL event instead of an DEVICE_FATAL event in the qp handler.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/smc_ib.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/net/smc/smc_ib.c b/net/smc/smc_ib.c
index 76487a16934e..0b244be24fe0 100644
--- a/net/smc/smc_ib.c
+++ b/net/smc/smc_ib.c
@@ -257,12 +257,20 @@ static void smc_ib_global_event_handler(struct ib_event_handler *handler,
 	smcibdev = container_of(handler, struct smc_ib_device, event_handler);
 
 	switch (ibevent->event) {
-	case IB_EVENT_PORT_ERR:
 	case IB_EVENT_DEVICE_FATAL:
+		/* terminate all ports on device */
+		for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++)
+			set_bit(port_idx, &smcibdev->port_event_mask);
+		schedule_work(&smcibdev->port_event_work);
+		break;
+	case IB_EVENT_PORT_ERR:
 	case IB_EVENT_PORT_ACTIVE:
+	case IB_EVENT_GID_CHANGE:
 		port_idx = ibevent->element.port_num - 1;
-		set_bit(port_idx, &smcibdev->port_event_mask);
-		schedule_work(&smcibdev->port_event_work);
+		if (port_idx < SMC_MAX_PORTS) {
+			set_bit(port_idx, &smcibdev->port_event_mask);
+			schedule_work(&smcibdev->port_event_work);
+		}
 		break;
 	default:
 		break;
@@ -294,13 +302,13 @@ static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
 	u8 port_idx;
 
 	switch (ibevent->event) {
-	case IB_EVENT_DEVICE_FATAL:
-	case IB_EVENT_GID_CHANGE:
-	case IB_EVENT_PORT_ERR:
+	case IB_EVENT_QP_FATAL:
 	case IB_EVENT_QP_ACCESS_ERR:
 		port_idx = ibevent->element.qp->port - 1;
-		set_bit(port_idx, &smcibdev->port_event_mask);
-		schedule_work(&smcibdev->port_event_work);
+		if (port_idx < SMC_MAX_PORTS) {
+			set_bit(port_idx, &smcibdev->port_event_mask);
+			schedule_work(&smcibdev->port_event_work);
+		}
 		break;
 	default:
 		break;