From f95c6f36afa7ff2929205b86ab2f1e674e12b1d2 Mon Sep 17 00:00:00 2001
From: Tor Egge <Tor.Egge@online.no>
Date: Thu, 15 Dec 2022 13:59:55 +0100
Subject: Avoid buffer overflow with empty automaton.

---
 fsa/src/vespa/fsa/automaton.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'fsa/src')

diff --git a/fsa/src/vespa/fsa/automaton.cpp b/fsa/src/vespa/fsa/automaton.cpp
index 88777f4e198..ee80fee0db1 100644
--- a/fsa/src/vespa/fsa/automaton.cpp
+++ b/fsa/src/vespa/fsa/automaton.cpp
@@ -341,6 +341,10 @@ void Automaton::PackedAutomaton::finalize()
         _packed_idx[i] = _pack_map[_packed_ptr[i]];
       }
     }
+    if (_blob_used == 0) {
+        _packable = false;
+        return;
+    }
 
     // compact blobs if the size is constant
     std::map<uint32_t,uint32_t> bcomp;
-- 
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