RDMA: Directly cast the sockaddr union to sockaddr

gcc 9 now does allocation size tracking and thinks that passing the member
of a union and then accessing beyond that member's bounds is an overflow.

Instead of using the union member, use the entire union with a cast to
get to the sockaddr. gcc will now know that the memory extends the full
size of the union.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/addr.c

@@ -731,8 +731,8 @@ int roce_resolve_route_from_path(struct sa_path_rec *rec,
 	if (rec->roce.route_resolved)
 		return 0;
 
-	rdma_gid2ip(&sgid._sockaddr, &rec->sgid);
-	rdma_gid2ip(&dgid._sockaddr, &rec->dgid);
+	rdma_gid2ip((struct sockaddr *)&sgid, &rec->sgid);
+	rdma_gid2ip((struct sockaddr *)&dgid, &rec->dgid);
 
 	if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
 		return -EINVAL;
@@ -743,7 +743,7 @@ int roce_resolve_route_from_path(struct sa_path_rec *rec,
 	dev_addr.net = &init_net;
 	dev_addr.sgid_attr = attr;
 
-	ret = addr_resolve(&sgid._sockaddr, &dgid._sockaddr,
+	ret = addr_resolve((struct sockaddr *)&sgid, (struct sockaddr *)&dgid,
 			   &dev_addr, false, true, 0);
 	if (ret)
 		return ret;
@@ -815,22 +815,22 @@ int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 	struct rdma_dev_addr dev_addr;
 	struct resolve_cb_context ctx;
 	union {
-		struct sockaddr     _sockaddr;
 		struct sockaddr_in  _sockaddr_in;
 		struct sockaddr_in6 _sockaddr_in6;
 	} sgid_addr, dgid_addr;
 	int ret;
 
-	rdma_gid2ip(&sgid_addr._sockaddr, sgid);
-	rdma_gid2ip(&dgid_addr._sockaddr, dgid);
+	rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
+	rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
 
 	memset(&dev_addr, 0, sizeof(dev_addr));
 	dev_addr.net = &init_net;
 	dev_addr.sgid_attr = sgid_attr;
 
 	init_completion(&ctx.comp);
-	ret = rdma_resolve_ip(&sgid_addr._sockaddr, &dgid_addr._sockaddr,
-			      &dev_addr, 1000, resolve_cb, true, &ctx);
+	ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
+			      (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
+			      resolve_cb, true, &ctx);
 	if (ret)
 		return ret;
 

drivers/infiniband/hw/ocrdma/ocrdma_ah.c

@@ -83,7 +83,6 @@ static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
 	struct iphdr ipv4;
 	const struct ib_global_route *ib_grh;
 	union {
-		struct sockaddr     _sockaddr;
 		struct sockaddr_in  _sockaddr_in;
 		struct sockaddr_in6 _sockaddr_in6;
 	} sgid_addr, dgid_addr;
@@ -133,9 +132,9 @@ static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
 		ipv4.tot_len = htons(0);
 		ipv4.ttl = ib_grh->hop_limit;
 		ipv4.protocol = nxthdr;
-		rdma_gid2ip(&sgid_addr._sockaddr, sgid);
+		rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
 		ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
-		rdma_gid2ip(&dgid_addr._sockaddr, &ib_grh->dgid);
+		rdma_gid2ip((struct sockaddr*)&dgid_addr, &ib_grh->dgid);
 		ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
 		memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
 	} else {

drivers/infiniband/hw/ocrdma/ocrdma_hw.c

@@ -2499,7 +2499,6 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
 	u16 vlan_id = 0xFFFF;
 	u8 mac_addr[6], hdr_type;
 	union {
-		struct sockaddr     _sockaddr;
 		struct sockaddr_in  _sockaddr_in;
 		struct sockaddr_in6 _sockaddr_in6;
 	} sgid_addr, dgid_addr;
@@ -2542,8 +2541,8 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
 
 	hdr_type = rdma_gid_attr_network_type(sgid_attr);
 	if (hdr_type == RDMA_NETWORK_IPV4) {
-		rdma_gid2ip(&sgid_addr._sockaddr, &sgid_attr->gid);
-		rdma_gid2ip(&dgid_addr._sockaddr, &grh->dgid);
+		rdma_gid2ip((struct sockaddr *)&sgid_addr, &sgid_attr->gid);
+		rdma_gid2ip((struct sockaddr *)&dgid_addr, &grh->dgid);
 		memcpy(&cmd->params.dgid[0],
 		       &dgid_addr._sockaddr_in.sin_addr.s_addr, 4);
 		memcpy(&cmd->params.sgid[0],