From f21791fe22512812a5f5988c001db9d6926b0ebb Mon Sep 17 00:00:00 2001
From: David Shah <davey1576@gmail.com>
Date: Tue, 18 Dec 2018 15:01:04 +0000
Subject: common/chain_utils: Don't allow overlapping chains

Signed-off-by: David Shah <davey1576@gmail.com>
---
 common/chain_utils.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/common/chain_utils.h b/common/chain_utils.h
index b783e30b..300d96a1 100644
--- a/common/chain_utils.h
+++ b/common/chain_utils.h
@@ -51,7 +51,8 @@ std::vector<CellChain> find_chains(const Context *ctx, F1 cell_type_predicate, F
             CellChain chain;
             CellInfo *end = start;
             while (end != nullptr) {
-                chain.cells.push_back(end);
+                if (chained.insert(end->name).second)
+                    chain.cells.push_back(end);
                 end = get_next(ctx, end);
             }
             if (chain.cells.size() >= min_length) {
-- 
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