Fix: Lock interest_mutex_ When interest_ Modified in ctlEx

EventMethEpollEquivImpl::ctlEx now locks interest_mutex_ when performing its add/mod/del actions. Previously, the interest_mutex_ lock was released before these add/mod/del actions were performed. This was confirmed to occasionally cause a "use after free" in findEmEventInAnInterestSet (called out of getReadyEmEvents) in another thread. It might also result in corruption of the interest_ std::set.
dgreatwood · Aug 30, 2024 · 4ac4d56 · 4ac4d56
1 parent eddff16
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diff --git a/src/common/eventmeth.cc b/src/common/eventmeth.cc
@@ -4037,6 +4037,8 @@ EmEventTmrFd::EmEventTmrFd(clockid_t clock_id,
 
         if (ctl_res == 0)
         {
+            GUARD_AND_DBG_LOG(interest_mutex_);
+
             switch(op)
             {
             case EvCtlAction::Add:

diff --git a/version.txt b/version.txt
@@ -1 +1 @@
-0.4.1.20240828
+0.4.2.20240829