The post match list was called with an unlocked flow until now.
However, recent de_state handling updates changed this. The stateful
detection code can now call the post match functions while keeping
the flow locked. The normal detection code still calls it with an
unlocked flow.
This patch adds a hint to the DetectEngineThreadCtx called
'flow_locked' that is set to true if the caller has already locked
the flow.
Creates an inline wrapper to check for flowvarlist == NULL before calling
DetectFlowvarProcessList() to remove the overhead of checking since the
list is usually empty.
Bug #802
Flowvars are set from pcre, and lock the flow when being set. However
when HTTP buffers were inspected, flow was already locked: deadlock.
This patch introduces a post-match list in the detection engine thread
ctx, where store candidates are kept. Then a post-match function is used
to finalize the storing if the rule matches.
Solves the deadlock and brings the handling of flowvars more in line
with flowbits and flowints.