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RDMA/cma: Initialize ib_sa_multicast structure to 0 when join 

commit e0fe97efdb upstream.

Initialize the structure to 0 so that it's fields won't have random
values. For example fields like rec.traffic_class (as well as
rec.flow_label and rec.sl) is used to generate the user AH through:
  cma_iboe_join_multicast
    cma_make_mc_event
      ib_init_ah_from_mcmember

And a random traffic_class causes a random IP DSCP in RoCEv2.

Fixes: b5de0c60cc ("RDMA/cma: Fix use after free race in roce multicast join")
Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Link: https://lore.kernel.org/r/20230927090511.603595-1-markzhang@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/1175/head
Mark Zhang 2023-09-27 12:05:11 +03:00 committed by Greg Kroah-Hartman
parent 52b0bb7139
commit 39f7018701
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/core/cma.c
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@ -4936,7 +4936,7 @@ static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
int err = 0;
struct sockaddr *addr = (struct sockaddr *)&mc->addr;
struct net_device *ndev = NULL;
struct ib_sa_multicast ib;
struct ib_sa_multicast ib = {};
enum ib_gid_type gid_type;
bool send_only;