Fix heap use after free in DNSProcessor::getby() (#3871)

oknet · zwoop · commit d5da3a001db3 · 2021-02-22T10:02:41.000-07:00
(cherry picked from commit e9ea6b0)
diff --git a/iocore/dns/DNS.cc b/iocore/dns/DNS.cc
@@ -1231,7 +1231,7 @@ DNSEntry::mainEvent(int event, Event *e)
     } else {
       Debug("dns", "adding first to collapsing queue");
       dnsH->entries.enqueue(this);
-      write_dns(dnsH);
+      dnsProcessor.thread->schedule_imm(dnsH);
     }
     return EVENT_DONE;
   }

Original file line number	Diff line number	Diff line change
`@@ -1231,7 +1231,7 @@ DNSEntry::mainEvent(int event, Event *e)`
`1231`	`1231`	`} else {`
`1232`	`1232`	`Debug("dns", "adding first to collapsing queue");`
`1233`	`1233`	`dnsH->entries.enqueue(this);`
`1234`		`- write_dns(dnsH);`
	`1234`	`+ dnsProcessor.thread->schedule_imm(dnsH);`
`1235`	`1235`	`}`
`1236`	`1236`	`return EVENT_DONE;`
`1237`	`1237`	`}`