From 2bcaa5448c7e583a5e4f063c54f930e857cebb06 Mon Sep 17 00:00:00 2001
From: Karl Vestin <karlvestin@localhost.localdomain>
Date: Wed, 12 Feb 2020 16:28:15 +0100
Subject: [PATCH] Added null check in modules/ca/src/client/udpiiu.cpp to
 prevent possible dereferencing of null pointer. Flagged as error by Codacy
 static code analysis.

Codacy link: https://app.codacy.com/gh/epics-base/epics-base/file/42103575495/issues/source?bid=16430872&fileBranchId=16430872#l950
Launchpad bug: https://bugs.launchpad.net/epics-base/+bug/1862916

LP: #1862916
---
 modules/ca/src/client/udpiiu.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/ca/src/client/udpiiu.cpp b/modules/ca/src/client/udpiiu.cpp
index fe15f1b69..4efa8ba32 100644
--- a/modules/ca/src/client/udpiiu.cpp
+++ b/modules/ca/src/client/udpiiu.cpp
@@ -946,7 +946,7 @@ bool udpiiu::pushDatagramMsg ( epicsGuard < epicsMutex > & guard,
 
     caHdr * pbufmsg = ( caHdr * ) &this->xmitBuf[this->nBytesInXmitBuf];
     *pbufmsg = msg;
-    if ( extsize ) {
+    if ( extsize && pExt ) {
         memcpy ( pbufmsg + 1, pExt, extsize );
         if ( extsize != alignedExtSize ) {
             char *pDest = (char *) ( pbufmsg + 1 );