Step 1: 
Sure, I will provide the solution with three different patching techniques.

Patching Technique 1: Integer Overflow Check
In this technique, we check if adding the `ticks_from_now` to the current time (`ble_npl_time_get()`) results in an integer overflow. If it does, the function returns immediately.

```c
if (ticks_from_now == BLE_HS_FOREVER) {
    return;
}

abs_time = ble_npl_time_get();

// Check for potential integer overflow
if ((INT32_MAX - abs_time) < ticks_from_now) {
    return; // Overflow detected, handle it accordingly
}

abs_time += ticks_from_now;
```

Patching Technique 2: Use a Safe Time API
In this technique, we use a safe time API that takes care of potential integer overflows. This can be the function `ble_npl_time_safe_add(int32_t time1, int32_t time2)` provided by the NanoStack's PAL layer.

```c
if (ticks_from_now == BLE_HS_FOREVER) {
    return;
}

abs_time = ble_npl_time_get();

// Use safe time addition API to prevent overflow
abs_time = ble_npl_time_safe_add(abs_time, ticks_from_now);
```

Patching Technique 3: Check for Negative Time Values
In this technique, we check if the resulting absolute time becomes negative. If it does, the function returns immediately, assuming that the `ticks_from_now` value is invalid and would result in an underflow.

```c
if (ticks_from_now == BLE_HS_FOREVER) {
    return;
}

abs_time = ble_npl_time_get() + ticks_from_now;

// Check for negative absolute time value
if (abs_time < 0) {
    return; // Underflow detected, handle it accordingly
}
```