From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Sun, 15 Jan 2023 22:20:06 +0000 (-0800)
Subject: common graph_init: fix memory leak
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a5445c382962a4d2125d53b1a0103b6c35eb176c;p=graphviz

common graph_init: fix memory leak

Gitlab: #1950
---

diff --git a/lib/common/input.c b/lib/common/input.c
index f40bc5103..1945aa709 100644
--- a/lib/common/input.c
+++ b/lib/common/input.c
@@ -638,9 +638,10 @@ void graph_init(graph_t * g, bool use_rankdir)
 
     /* reparseable input */
     if ((p = agget(g, "postaction"))) {   /* requires a graph wrapper for yyparse */
-        char *buf = gmalloc(strlen("digraph {  }") + strlen(p) + 1);
-        sprintf(buf,"%s { %s }",agisdirected(g)?"digraph":"graph",p);
-        agmemconcat(g, buf);
+        agxbuf buf = {0};
+        agxbprint(&buf, "%s { %s }", agisdirected(g) ? "digraph" : "graph", p);
+        agmemconcat(g, agxbuse(&buf));
+        agxbfree(&buf);
     }
 
     /* set this up fairly early in case any string sizes are needed */