Stack overflow in DetectFlowbitsAnalyze
When doing torture tests, I discovered a stack overflow in DetectFlowbitsAnalyze. I have made a PR to github @ https://github.com/OISF/suricata/pull/5103
Overflow happens when number of flowbits is sufficiently large which in turn causes array containing FBAnalyze structs to be greater than stack size.
Changeset should apply cleanly to 5.x too.