c
// Hypothetical changes elsewhere in the code
struct netvsc_device {
    // ...
    void (*cleanup)(struct netvsc_device *);
    // ...
};

// When setting up the device
nvdev->cleanup = free_netvsc_resources;

// Cleanup function
void free_netvsc_resources(struct netvsc_device *nvdev) {
    if (nvdev->recv_buf) {
        vfree(nvdev->recv_buf);
        nvdev->recv_buf = NULL;
    }
    // Free other resources...
}

// Replace direct calls with the cleanup function
7 	kfree(nvdev->extension);
8 	if (nvdev->cleanup) {
9 		nvdev->cleanup(nvdev);
10 	}
