Check for null pointer dereference (almost) everywhere

[marcstern]

Added a design doc explaining the approach

[airween]

The use of assertions will terminate the process, right? Is that what you want?

You can control the behavior with a macro. See the identical solution in case of libmodsecurity3. Here @gberkes introduced a new CFLAG, which can be controlled with a configure option. It's disabled by default, so the process won't terminate - but we can use that in our test environment.

[marcstern]

The use of assertions will terminate the process, right? Is that what you want?

Yes, as it's an impossible path, unless the implementation is bogus

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
22.0% Duplication on New Code (required ≤ 3%)
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[airween]

Looks good to me. I think the SonarCloud reports are false positives, all mentioned duplicate code had added years ago. Merging now - thanks, Marc.