BIND 10 master, updated. 89e0087450e73ea2336f56c0f7024f4741eaeba0 [master] exit from SyncUDPServer::handleRead immediately if stopped.

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- Log -----------------------------------------------------------------
commit 89e0087450e73ea2336f56c0f7024f4741eaeba0
Author: JINMEI Tatuya <jinmei at isc.org>
Date:   Wed May 8 23:05:14 2013 -0700

    [master] exit from SyncUDPServer::handleRead immediately if stopped.
    
    while not really correct, this seems to work as a workaround for the crash
    problem reported in #2946.
    okayed on jabber.

-----------------------------------------------------------------------

Summary of changes:
 src/lib/asiodns/sync_udp_server.cc |    9 +++++++++
 1 file changed, 9 insertions(+)

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diff --git a/src/lib/asiodns/sync_udp_server.cc b/src/lib/asiodns/sync_udp_server.cc
index 9a06691..989484f 100644
--- a/src/lib/asiodns/sync_udp_server.cc
+++ b/src/lib/asiodns/sync_udp_server.cc
@@ -75,6 +75,15 @@ SyncUDPServer::scheduleRead() {
 
 void
 SyncUDPServer::handleRead(const asio::error_code& ec, const size_t length) {
+    // If the server has been stopped, it could even have been destroyed
+    // by the time of this call.  We'll solve this problem in #2946, but
+    // until then we exit as soon as possible without accessing any other
+    // invalidated fields (note that referencing stopped_ is also incorrect,
+    // but experiments showed it often keeps the original value in practice,
+    // so we live with it until the complete fix).
+    if (stopped_) {
+        return;
+    }
     if (ec) {
         using namespace asio::error;
         const asio::error_code::value_type err_val = ec.value();