From: Maor Gottlieb <maorg@nvidia.com>
Date: Tue, 18 Jan 2022 09:35:00 +0200
Subject: RDMA/cma: Use correct address when leaving multicast group
Patch-mainline: v5.17-rc3
Git-commit: d9e410ebbed9d091b97bdf45b8a3792e2878dc48
References: git-fixes
In RoCE we should use cma_iboe_set_mgid() and not cma_set_mgid to generate
the mgid, otherwise we will generate an IGMP for an incorrect address.
Fixes: b5de0c60cc30 ("RDMA/cma: Fix use after free race in roce multicast join")
Link: https://lore.kernel.org/r/913bc6783fd7a95fe71ad9454e01653ee6fb4a9a.1642491047.git.leonro@nvidia.com
Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/cma.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -67,8 +67,8 @@ static const char * const cma_events[] =
[RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
};
-static void cma_set_mgid(struct rdma_id_private *id_priv, struct sockaddr *addr,
- union ib_gid *mgid);
+static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
+ enum ib_gid_type gid_type);
const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
{
@@ -1846,17 +1846,19 @@ static void destroy_mc(struct rdma_id_pr
if (dev_addr->bound_dev_if)
ndev = dev_get_by_index(dev_addr->net,
dev_addr->bound_dev_if);
- if (ndev) {
+ if (ndev && !send_only) {
+ enum ib_gid_type gid_type;
union ib_gid mgid;
- cma_set_mgid(id_priv, (struct sockaddr *)&mc->addr,
- &mgid);
-
- if (!send_only)
- cma_igmp_send(ndev, &mgid, false);
-
- dev_put(ndev);
+ gid_type = id_priv->cma_dev->default_gid_type
+ [id_priv->id.port_num -
+ rdma_start_port(
+ id_priv->cma_dev->device)];
+ cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid,
+ gid_type);
+ cma_igmp_send(ndev, &mgid, false);
}
+ dev_put(ndev);
cancel_work_sync(&mc->iboe_join.work);
}