------------------------------------------------------------
revno: 13238
revision-id: squid3@treenet.co.nz-20160506094614-zyjq1i8ym2gcvwbu
parent: squid3@treenet.co.nz-20160506091244-3td2be9qbzsajxg8
committer: Amos Jeffries <squid3@treenet.co.nz>
branch nick: 3.4
timestamp: Fri 2016-05-06 21:46:14 +1200
message:
  Fix SIGSEGV in ESIContext response handling
  
  HttpReply pointer was being unlocked without heving been locked.
  Resulting in a double-free. Make it use RefCount instead of
  manual locking to ensure locked/unlock is always symmetrical.
------------------------------------------------------------
# Bazaar merge directive format 2 (Bazaar 0.90)
# revision_id: squid3@treenet.co.nz-20160506094614-zyjq1i8ym2gcvwbu
# target_branch: http://bzr.squid-cache.org/bzr/squid3/3.4
# testament_sha1: 4ff01cd3aaffb8c9b20b8595d2ee0ccfcf434b3f
# timestamp: 2016-05-06 09:48:45 +0000
# source_branch: http://bzr.squid-cache.org/bzr/squid3/3.4
# base_revision_id: squid3@treenet.co.nz-20160506091244-\
#   3td2be9qbzsajxg8
# 
# Begin patch
=== modified file 'src/esi/Esi.cc'
--- src/esi/Esi.cc	2016-04-20 11:15:14 +0000
+++ src/esi/Esi.cc	2016-05-06 09:46:14 +0000
@@ -598,7 +598,7 @@
 
 #endif
 
-    if (!(rep || (outbound.getRaw() &&
+    if (!(rep != NULL || (outbound.getRaw() &&
                   outbound->len && (outbound_offset <= outbound->len)))) {
         debugs(86, 5, "ESIContext::send: Nothing to send.");
         return 0;
@@ -643,18 +643,18 @@
     flags.clientwantsdata = 0;
     debugs(86, 5, "ESIContext::send: this=" << this << " Client no longer wants data ");
     /* Deal with re-entrancy */
-    HttpReply *temprep = rep;
+    HttpReply::Pointer temprep = rep;
     rep = NULL; /* freed downstream */
 
-    if (temprep && varState)
-        varState->buildVary (temprep);
+    if (temprep != NULL && varState)
+        varState->buildVary(temprep.raw());
 
     {
         StoreIOBuffer tempBuffer;
         tempBuffer.length = len;
         tempBuffer.offset = pos - len;
         tempBuffer.data = next->readBuffer.data;
-        clientStreamCallback (thisNode, http, temprep, tempBuffer);
+        clientStreamCallback (thisNode, http, temprep.raw(), tempBuffer);
     }
 
     if (len == 0)
@@ -1284,7 +1284,7 @@
         ++parserState.stackdepth;
     }
 
-    if (rep && !parserState.inited())
+    if (rep != NULL && !parserState.inited())
         parserState.init(this);
 
     /* we have data */
@@ -1423,7 +1423,7 @@
 {
     debugs(86, 5, HERE << "Freeing for this=" << this);
 
-    HTTPMSGUNLOCK(rep);
+    rep = NULL; // refcounted
 
     finishChildren ();
 

diff --git src/esi/Context.h src/esi/Context.h
index baae3fd..dcdcf05 100644
--- src/esi/Context.h
+++ src/esi/Context.h
@@ -36,6 +36,7 @@
 #include "esi/Element.h"
 #include "clientStream.h"
 #include "err_type.h"
+#include "HttpReply.h"
 #include "HttpStatusCode.h"
 
 class ESIVarState;
@@ -116,7 +117,7 @@ public:
     err_type errorpage; /* if we error what page to use */
     http_status errorstatus; /* if we error, what code to return */
     char *errormessage; /* error to pass to error page */
-    HttpReply *rep; /* buffered until we pass data downstream */
+    HttpReply::Pointer rep; /* buffered until we pass data downstream */
     ESISegment::Pointer buffered; /* unprocessed data - for whatever reason */
     ESISegment::Pointer incoming;
     /* processed data we are waiting to send, or for