Fix memory management bug in unset_ERRNO.

2 files changed, 6 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 4a0360ab..0d405abf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2012-04-09         Andrew J. Schorr     <aschorr@telemetry-investments.com>
+
+	* eval.c (unset_ERRNO): Fix memory management bug -- need to use
+	dupnode with Nnull_string.
+
 2012-04-08         Andrew J. Schorr     <aschorr@telemetry-investments.com>
 
 	* Makefile.am (valgrind): Define VALGRIND instead of redefining AWK.
diff --git a/eval.c b/eval.c
index 82cca9ed..e3ab52eb 100644
--- a/eval.c
+++ b/eval.c
@@ -1021,7 +1021,7 @@ void
 unset_ERRNO(void)
 {
 	unref(ERRNO_node->var_value);
-	ERRNO_node->var_value = Nnull_string;
+	ERRNO_node->var_value = dupnode(Nnull_string);
 }
 
 /* update_NR --- update the value of NR */