Corrected a rare case where a NULL value propagates in the flattening

routine and is not caught until it causes a segfault.
RTimothyEdwards · Aug 16, 2024 · 2b88d79 · 2b88d79
1 parent bf4112d
commit 2b88d79
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/VERSION b/VERSION
@@ -1 +1 @@
-1.5.276
+1.5.277
diff --git a/base/flatten.c b/base/flatten.c
@@ -600,8 +600,10 @@ int flattenInstancesOf(char *name, int fnum, char *instance)
          else break;
 
          /* Put the child cell at the start of ChildObjList */
-         ChildEnd->next = ChildObjList;
-         ChildObjList = ChildStart;
+	 if (ChildEnd) {
+            ChildEnd->next = ChildObjList;
+            ChildObjList = ChildStart;
+	 }
       }
 
       /* Put the child cell at the start of ChildObjList */