From 8f870ddeca261c331016821488adb7af0977fa04 Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Tue, 20 Mar 2007 12:44:36 -0400
Subject: BUG: fix coverity error, null check after usage fix

---
 Source/CPack/cmCPackTarCompressGenerator.cxx | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Source/CPack/cmCPackTarCompressGenerator.cxx b/Source/CPack/cmCPackTarCompressGenerator.cxx
index 8192f70..b73e553 100644
--- a/Source/CPack/cmCPackTarCompressGenerator.cxx
+++ b/Source/CPack/cmCPackTarCompressGenerator.cxx
@@ -225,15 +225,18 @@ int cmCPackTarCompressGenerator::CompressFiles(const char* outFileName,
 int cmCPackTarCompress_Compress_Output(void* client_data,
   const char* data, int data_length)
 {
+  if(!client_data)
+    {
+    return 0;
+    }
   cmcompress_stream *cstream = static_cast<cmcompress_stream*>(client_data);
   cmCPackTarCompress_Data *mydata
     = static_cast<cmCPackTarCompress_Data*>(cstream->client_data);
-  mydata->OutputStream->write(data, data_length);
-
   if ( !mydata->OutputStream )
     {
     return 0;
     }
+  mydata->OutputStream->write(data, data_length);
   return data_length;
 }
 
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