6.5-stable review patch. If anyone has any objections, please let me know.
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From: Mark Zhang markzhang@nvidia.com
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: b5de0c60cc30 ("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 --- drivers/infiniband/core/cma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -4946,7 +4946,7 @@ static int cma_iboe_join_multicast(struc 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;