static int opl3_load_patch(int dev, int format, const char __user *addr,
		int count, int pmgr_flag)
{
	struct sbi_instrument ins;

	if (count <sizeof(ins))
	{
		printk(KERN_WARNING "FM Error: Patch record too short\n");
		return -EINVAL;
	}

	if (copy_from_user(&ins, addr, sizeof(ins)))
		return -EFAULT;

	if (ins.channel < 0 || ins.channel >= SBFM_MAXINSTR)
	{
		printk(KERN_WARNING "FM Error: Invalid instrument number %d\n", ins.channel);
		return -EINVAL;
	}
	ins.key = format;

	return store_instr(ins.channel, &ins);
}
Weaknesses in this category are related to improper calculation or conversion of numbers.