From 62404ac9ebde8c4ebf6c7b66b8c7799e90ab5e51 Mon Sep 17 00:00:00 2001
From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Sat, 14 Nov 2020 11:49:12 -0800
Subject: [PATCH] anticipate tight_subtree_search() returning a negative value
 as error

Related to #1801.
---
 lib/common/ns.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/common/ns.c b/lib/common/ns.c
index e47ec6616..0f88c0511 100644
--- a/lib/common/ns.c
+++ b/lib/common/ns.c
@@ -298,6 +298,10 @@ static subtree_t *find_tight_subtree(Agnode_t *v)
     rv = NEW(subtree_t);
     rv->rep = v;
     rv->size = tight_subtree_search(v,rv);
+    if (rv->size < 0) {
+        free(rv);
+        return NULL;
+    }
     rv->par = rv;
     return rv;
 }
-- 
2.40.0