From 5a8adb6eb0b959470859f1a8ab8cff1d09feeb56 Mon Sep 17 00:00:00 2001
From: Masaori Koshiba <masaori@apache.org>
Date: Tue, 26 Jul 2022 09:48:29 +0900
Subject: [PATCH] Add RangeTransform::m_write_vio state checks

---
 proxy/Transform.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/proxy/Transform.cc b/proxy/Transform.cc
index 664e310df6b..5013d3192ac 100644
--- a/proxy/Transform.cc
+++ b/proxy/Transform.cc
@@ -791,7 +791,9 @@ RangeTransform::handle_event(int event, void *edata)
   } else {
     switch (event) {
     case VC_EVENT_ERROR:
-      m_write_vio.cont->handleEvent(VC_EVENT_ERROR, &m_write_vio);
+      if (m_write_vio.cont) {
+        m_write_vio.cont->handleEvent(VC_EVENT_ERROR, &m_write_vio);
+      }
       break;
     case VC_EVENT_WRITE_COMPLETE:
       ink_assert(m_output_vio == (VIO *)edata);
@@ -814,6 +816,10 @@ RangeTransform::handle_event(int event, void *edata)
         }
       }
 
+      if (!m_write_vio.mutex) {
+        return 0;
+      }
+
       MUTEX_TRY_LOCK(trylock, m_write_vio.mutex, this_ethread());
       if (!trylock.is_locked()) {
         retry(10);