From 2c6a654bcfcd3bb6995266a2b1e8b076da97d8ae Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 1 Mar 2022 13:54:03 +0200
Subject: Fix bug in JSON serializer buffer growth logic

---
 libbutl/json/serializer.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libbutl/json/serializer.cxx b/libbutl/json/serializer.cxx
index 6f9bc95..84941ed 100644
--- a/libbutl/json/serializer.cxx
+++ b/libbutl/json/serializer.cxx
@@ -363,7 +363,9 @@ namespace butl
         if (overflow_ == nullptr)
           return false;
 
-        overflow_ (data_, e, buf_, size + extra - cap);
+        extra += size;
+        extra -= cap;
+        overflow_ (data_, e, buf_, extra > min ? extra : min);
         cap = buf_.capacity - buf_.size;
 
         return cap >= min;
-- 
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