MISSING VALUES: Fix free of indeterminate pointer.

If the main "while" loop in this function falls through immediately without
ever executing its body, then 'v' is passed to free() without ever being
initialized.

Found by Clang (http://clang-analyzer.llvm.org).

diff --git a/src/language/dictionary/missing-values.c b/src/language/dictionary/missing-values.c
index 819b0a9021cfe5821b4060e02b9932830b2a6120..22fe4436f0500e9f93b54b97ae48962c2a2663db 100644 (file)
--- a/src/language/dictionary/missing-values.c
+++ b/src/language/dictionary/missing-values.c
@@ -1,5 +1,5 @@
 /* PSPP - a program for statistical analysis.
-   Copyright (C) 1997-9, 2000, 2006, 2009 Free Software Foundation, Inc.
+   Copyright (C) 1997-9, 2000, 2006, 2009, 2010 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -38,7 +38,7 @@
 int
 cmd_missing_values (struct lexer *lexer, struct dataset *ds)
 {
-  struct variable **v;
+  struct variable **v = NULL;
   size_t nv;
 
   int retval = CMD_FAILURE;