966 static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd,  in mptcp_put_subflow_data()  argument
971 	u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd));  in mptcp_put_subflow_data()
974 		copied += sfd->size_subflow_data;  in mptcp_put_subflow_data()
981 	if (copy_to_user(optval, sfd, copylen))  in mptcp_put_subflow_data()
987 static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd,  in mptcp_get_subflow_data()  argument
999 	BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE);  in mptcp_get_subflow_data()
1004 	memset(sfd, 0, sizeof(*sfd));  in mptcp_get_subflow_data()
1006 	copylen = min_t(unsigned int, len, sizeof(*sfd));  in mptcp_get_subflow_data()
1007 	if (copy_from_user(sfd, optval, copylen))  in mptcp_get_subflow_data()
1011 	if (sfd->size_subflow_data > INT_MAX ||  in mptcp_get_subflow_data()
1012 	    sfd->size_user > INT_MAX)  in mptcp_get_subflow_data()
1015 	if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE ||  in mptcp_get_subflow_data()
1016 	    sfd->size_subflow_data > len)  in mptcp_get_subflow_data()
1019 	if (sfd->num_subflows || sfd->size_kernel)  in mptcp_get_subflow_data()
1022 	return len - sfd->size_subflow_data;  in mptcp_get_subflow_data()
1031 	struct mptcp_subflow_data sfd;  in mptcp_getsockopt_tcpinfo()  local
1035 	len = mptcp_get_subflow_data(&sfd, optval, optlen);  in mptcp_getsockopt_tcpinfo()
1039 	sfd.size_kernel = sizeof(struct tcp_info);  in mptcp_getsockopt_tcpinfo()
1040 	sfd.size_user = min_t(unsigned int, sfd.size_user,  in mptcp_getsockopt_tcpinfo()
1043 	infoptr = optval + sfd.size_subflow_data;  in mptcp_getsockopt_tcpinfo()
1052 		if (len && len >= sfd.size_user) {  in mptcp_getsockopt_tcpinfo()
1057 			if (copy_to_user(infoptr, &info, sfd.size_user)) {  in mptcp_getsockopt_tcpinfo()
1062 			infoptr += sfd.size_user;  in mptcp_getsockopt_tcpinfo()
1063 			copied += sfd.size_user;  in mptcp_getsockopt_tcpinfo()
1064 			len -= sfd.size_user;  in mptcp_getsockopt_tcpinfo()
1070 	sfd.num_subflows = sfcount;  in mptcp_getsockopt_tcpinfo()
1072 	if (mptcp_put_subflow_data(&sfd, optval, copied, optlen))  in mptcp_getsockopt_tcpinfo()
1123 	struct mptcp_subflow_data sfd;  in mptcp_getsockopt_subflow_addrs()  local
1127 	len = mptcp_get_subflow_data(&sfd, optval, optlen);  in mptcp_getsockopt_subflow_addrs()
1131 	sfd.size_kernel = sizeof(struct mptcp_subflow_addrs);  in mptcp_getsockopt_subflow_addrs()
1132 	sfd.size_user = min_t(unsigned int, sfd.size_user,  in mptcp_getsockopt_subflow_addrs()
1135 	addrptr = optval + sfd.size_subflow_data;  in mptcp_getsockopt_subflow_addrs()
1144 		if (len && len >= sfd.size_user) {  in mptcp_getsockopt_subflow_addrs()
1149 			if (copy_to_user(addrptr, &a, sfd.size_user)) {  in mptcp_getsockopt_subflow_addrs()
1154 			addrptr += sfd.size_user;  in mptcp_getsockopt_subflow_addrs()
1155 			copied += sfd.size_user;  in mptcp_getsockopt_subflow_addrs()
1156 			len -= sfd.size_user;  in mptcp_getsockopt_subflow_addrs()
1162 	sfd.num_subflows = sfcount;  in mptcp_getsockopt_subflow_addrs()
1164 	if (mptcp_put_subflow_data(&sfd, optval, copied, optlen))  in mptcp_getsockopt_subflow_addrs()