static int futex_atomic_op_inuser(unsigned int encoded_op, u32 __user *uaddr)
{
	unsigned int op =	  (encoded_op & 0x70000000) >> 28;
	unsigned int cmp =	  (encoded_op & 0x0f000000) >> 24;
	int oparg = sign_extend32((encoded_op & 0x00fff000) >> 12, 11);
	int cmparg = sign_extend32(encoded_op & 0x00000fff, 11);
	int oldval, ret;

	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) {
		if (oparg < 0 || oparg > 31) {
			char comm[sizeof(current->comm)];
			/*
			 * kill this print and return -EINVAL when userspace
			 * is sane again
			 */
			pr_info_ratelimited("futex_wake_op: %s tries to shift op by %d; fix this program\n",
					get_task_comm(comm, current), oparg);
			oparg &= 31;
		}
		oparg = 1 << oparg;
	}

	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	ret = arch_futex_atomic_op_inuser(op, oparg, &oldval, uaddr);
	if (ret)
		return ret;

	switch (cmp) {
	case FUTEX_OP_CMP_EQ:
		return oldval == cmparg;
	case FUTEX_OP_CMP_NE:
		return oldval != cmparg;
	case FUTEX_OP_CMP_LT:
		return oldval < cmparg;
	case FUTEX_OP_CMP_GE:
		return oldval >= cmparg;
	case FUTEX_OP_CMP_LE:
		return oldval <= cmparg;
	case FUTEX_OP_CMP_GT:
		return oldval > cmparg;
	default:
		return -ENOSYS;
	}
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.