From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Sat, 24 Apr 2021 03:01:04 +0000 (-0700)
Subject: anticipate failure from add_p_edges
X-Git-Tag: 2.47.2~13^2~27
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4a05ed66f88b1116e74e972e964c18a46ea068b7;p=graphviz

anticipate failure from add_p_edges

Related to #1801.
---

diff --git a/lib/ortho/ortho.c b/lib/ortho/ortho.c
index 716b2a724..ff9d89960 100644
--- a/lib/ortho/ortho.c
+++ b/lib/ortho/ortho.c
@@ -1096,8 +1096,12 @@ assignTracks (maze* mp)
     }
 
     /* add edges between parallel segments + remove appropriate edges */
-    add_p_edges(mp->hchans, mp);
-    add_p_edges(mp->vchans, mp);
+    if (add_p_edges(mp->hchans, mp) != 0) {
+	return -1;
+    }
+    if (add_p_edges(mp->vchans, mp) != 0) {
+	return -1;
+    }
 
     /* Assign the tracks after a top sort */
     assignTrackNo (mp->hchans);