From 010e046e6b7e2b15db41e2a04e8592acf71ccfd0 Mon Sep 17 00:00:00 2001
From: rlar <rlar>
Date: Sat, 31 Jul 2010 17:04:37 +0000
Subject: [PATCH] work around a segmentation fault, plot .. vs vec

---
 ChangeLog            | 6 ++++++
 src/frontend/parse.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 3cdf170c3..5cbf7f35b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-07-31  Robert Larice
+ * src/frontend/parse.c :
+    work around a segmentation fault, when plotting
+      plot something vs vec
+    vec was freed too early
+
 2010-07-31  Robert Larice
  * src/frontend/vectors.c :
     fix an ancient typo, responsible for segfault or garbage
diff --git a/src/frontend/parse.c b/src/frontend/parse.c
index 28672c2f4..9a223a6b1 100644
--- a/src/frontend/parse.c
+++ b/src/frontend/parse.c
@@ -416,7 +416,7 @@ free_pnode_x(struct pnode *t)
 	free_pnode(t->pn_right);
 	free_pnode(t->pn_next);
 	tfree(t->pn_name); /* va: it is a copy() of original string, can be free'd */
-	if (t->pn_value)
+	if (t->pn_value && !(t->pn_value->v_flags & VF_PERMANENT))
 	    vec_free(t->pn_value); /* patch by Stefan Jones */
 	tfree(t);
     }