net: rds: drop VLA in rds_for_each_conn_info()

Avoid VLA[1] by using an already allocated buffer passed
by the caller.

[1] https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Salvatore Mesoraca <s.mesoraca16@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rds/ib.c

@@ -321,8 +321,11 @@ static void rds_ib_ic_info(struct socket *sock, unsigned int len,
 			   struct rds_info_iterator *iter,
 			   struct rds_info_lengths *lens)
 {
+	u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8];
+
 	rds_for_each_conn_info(sock, len, iter, lens,
 				rds_ib_conn_info_visitor,
+				buffer,
 				sizeof(struct rds_info_rdma_connection));
 }