c
// ... existing code ...

// Assumption: app_req.num_ports is validated to be within a safe range.

size = sizeof(struct app_stats_reply) + (app_req.num_ports * sizeof(app_reply->elem[0])); 
// Assuming 'elem' is an array of some type within struct app_stats_reply

app_reply = kzalloc(size, GFP_KERNEL);
if (!app_reply) {
    // ... error handling ...
}

// ... existing code ...

// Assuming the loop iterates over fcport structures 
for (pcnt = 0; pcnt < app_req.num_ports && fcport != NULL; pcnt++) { // Loop control
    // ... existing code ...

    if (fcport->edif.enable) { 
        // Safe access within the validated bounds:
        app_reply->elem[pcnt].rekey_count =  // ... rest of your assignment 
    }

    // ... existing code, potentially updating fcport ...
}

// ... rest of the function ...
