From: Dan Carpenter <error27@gmail.com>
Date: Tue, 24 Jan 2023 18:20:54 +0300
Subject: RDMA/mana_ib: Prevent array underflow in mana_ib_create_qp_raw()
Patch-mainline: v6.2-rc8
Git-commit: 563ca0e9eab8acc8a1309e8b440108ff8d23e951
References: bsc#1210741 jsc#PED-4022

The "port" comes from the user and if it is zero then the:

	ndev = mc->ports[port - 1];

assignment does an out of bounds read.  I have changed the if
statement to fix this and to mirror how it is done in
mana_ib_create_qp_rss().

Fixes: 0266a177631d ("RDMA/mana_ib: Add a driver for Microsoft Azure Network Adapter")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/Y8/3Vn8qx00kE9Kk@kili
Acked-by: Long Li <longli@microsoft.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/mana/qp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mana/qp.c
+++ b/drivers/infiniband/hw/mana/qp.c
@@ -289,7 +289,7 @@ static int mana_ib_create_qp_raw(struct
 
 	/* IB ports start with 1, MANA Ethernet ports start with 0 */
 	port = ucmd.port;
-	if (ucmd.port > mc->num_ports)
+	if (port < 1 || port > mc->num_ports)
 		return -EINVAL;
 
 	if (attr->cap.max_send_wr > MAX_SEND_BUFFERS_PER_QUEUE) {