[PATCH 4.4 039/193] RDMA/cma: Make sure that PSN is not over max allowed

From: Greg Kroah-Hartman
Date: Fri Feb 23 2018 - 13:36:16 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Moni Shoua <monis@xxxxxxxxxxxx>


[ Upstream commit 23a9cd2ad90543e9da3786878d2b2729c095439d ]

This patch limits the initial value for PSN to 24 bits as
spec requires.

Signed-off-by: Moni Shoua <monis@xxxxxxxxxxxx>
Signed-off-by: Mukesh Kacker <mukesh.kacker@xxxxxxxxxx>
Signed-off-by: Daniel Jurgens <danielj@xxxxxxxxxxxx>
Reviewed-by: Parav Pandit <parav@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/cma.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -626,6 +626,7 @@ struct rdma_cm_id *rdma_create_id(struct
INIT_LIST_HEAD(&id_priv->mc_list);
get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
id_priv->id.route.addr.dev_addr.net = get_net(net);
+ id_priv->seq_num &= 0x00ffffff;

return &id_priv->id;
}