Handle m_processLauncher being null in ChildProcessProxy::processIden…

…tifier()

https://bugs.webkit.org/show_bug.cgi?id=167713
rdar://problem/28896113

Reviewed by Dan Bernstein.

This can happen if the process has been explicitly terminated.

* UIProcess/ChildProcessProxy.h:
(WebKit::ChildProcessProxy::processIdentifier):

Canonical link: https://commits.webkit.org/184779@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@211565 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebKit2/ChangeLog

@@ -1,3 +1,16 @@
+2017-02-01  Anders Carlsson  <andersca@apple.com>
+
+        Handle m_processLauncher being null in ChildProcessProxy::processIdentifier()
+        https://bugs.webkit.org/show_bug.cgi?id=167713
+        rdar://problem/28896113
+
+        Reviewed by Dan Bernstein.
+
+        This can happen if the process has been explicitly terminated.
+
+        * UIProcess/ChildProcessProxy.h:
+        (WebKit::ChildProcessProxy::processIdentifier):
+
 2017-02-02  Yongjun Zhang  <yongjun_zhang@apple.com>
 
         In iOS, we should take background assertion when accessing localstorage databases.

Source/WebKit2/UIProcess/ChildProcessProxy.h

@@ -71,7 +71,7 @@ class ChildProcessProxy : ProcessLauncher::Client, public IPC::Connection::Clien
     };
     State state() const;
 
-    pid_t processIdentifier() const { return m_processLauncher->processIdentifier(); }
+    pid_t processIdentifier() const { return m_processLauncher ? m_processLauncher->processIdentifier() : 0; }
 
     bool canSendMessage() const { return state() != State::Terminated;}
     bool sendMessage(std::unique_ptr<IPC::Encoder>, OptionSet<IPC::SendOption>);