RDMA/cma: Fix arguments order in net device validation

[ Upstream commit 27cfde795a96aef1e859a5480489944b95421e46 ]

Fix the order of source and destination addresses when resolving the
route between server and client to validate use of correct net device.

The reverse order we had so far didn't actually validate the net device
as the server would try to resolve the route to itself, thus always
getting the server's net device.

The issue was discovered when running cm applications on a single host
between 2 interfaces with same subnet and source based routing rules.
When resolving the reverse route the source based route rules were
ignored.

Fixes: f887f2ac87c2 ("IB/cma: Validate routing of incoming requests")
Link: https://lore.kernel.org/r/1c1ec2277a131d277ebcceec987fd338d35b775f.1661251872.git.leonro@nvidia.com
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 3c40aa50cd60c17064c4187b1a92fe307c0ebd1c..b5fa19a033c0aa636207985d1ab05866e48127a8 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -1722,8 +1722,8 @@ cma_ib_id_from_event(struct ib_cm_id *cm_id,
                }
 
                if (!validate_net_dev(*net_dev,
-                                (struct sockaddr *)&req->listen_addr_storage,
-                                (struct sockaddr *)&req->src_addr_storage)) {
+                                (struct sockaddr *)&req->src_addr_storage,
+                                (struct sockaddr *)&req->listen_addr_storage)) {
                        id_priv = ERR_PTR(-EHOSTUNREACH);
                        goto err;
                }