From 4cb33019c9b50255ba09a174020195ea20701141 Mon Sep 17 00:00:00 2001
From: Jeff Hill <johill@lanl.gov>
Date: Tue, 28 May 2002 23:54:46 +0000
Subject: [PATCH] fixed race condition occuring when a put notify is canceled
 by a ca clear channel at the same instant that it completes

---
 src/rsrv/camessage.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/rsrv/camessage.c b/src/rsrv/camessage.c
index 298d2279b..dee194232 100644
--- a/src/rsrv/camessage.c
+++ b/src/rsrv/camessage.c
@@ -1413,7 +1413,9 @@ void write_notify_reply(void *pArg)
          */
         epicsMutexMustLock(pClient->putNotifyLock);
         ppnb = (RSRVPUTNOTIFY *)ellGet(&pClient->putNotifyQue);
-        ppnb->onExtraLaborQueue = FALSE;
+        if ( ppnb ) {
+            ppnb->onExtraLaborQueue = FALSE;
+        }
         epicsMutexUnlock(pClient->putNotifyLock);
         /*
          * break to loop exit