static ssize_t uio_write(struct file *filep, const char __user *buf,
			size_t count, loff_t *ppos)
{
	struct uio_listener *listener = filep->private_data;
	struct uio_device *idev = listener->dev;
	ssize_t retval;
	s32 irq_on;

	if (!idev->info->irq)
		return -EIO;

	if (count != sizeof(s32))
		return -EINVAL;

	if (!idev->info->irqcontrol)
		return -ENOSYS;

	if (copy_from_user(&irq_on, buf, count))
		return -EFAULT;

	retval = idev->info->irqcontrol(idev->info, irq_on);

	return retval ? retval : sizeof(s32);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.