bug 1439340 - lock addr_info in nsHostRecord::RemoveOrRefresh r=valentin

MozReview-Commit-ID: 6h4Sk1NjAJT

--HG--
extra : rebase_source : a8d54768f7493d8e2e1f435fe5a1e5c6e245ffb7

netwerk/dns/nsHostResolver.cpp

@@ -476,6 +476,7 @@ nsHostRecord::RemoveOrRefresh()
 {
     // no need to flush TRRed names, they're not resolved "locally"
     Cancel();
+    MutexAutoLock lock(addr_info_lock);
     if (addr_info && addr_info->IsTRR()) {
         return false;
     }