Mark Zhang 7de0e42444 RDMA/cma: Initialize ib_sa_multicast structure to 0 when join
commit e0fe97efdb00f0f32b038a4836406a82886aec9c 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>
2023-10-10 21:53:39 +02:00
2023-10-10 21:53:38 +02:00
2023-04-05 11:23:43 +02:00
2023-06-21 15:45:38 +02:00
2023-09-23 11:01:11 +02:00

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