From eb1ac0cebc041e51989fcaadc6e739aab437f94b Mon Sep 17 00:00:00 2001
From: Kevin Heifner <heifnerk@objectcomputing.com>
Date: Fri, 1 Jun 2018 00:05:25 -0500
Subject: [PATCH] Change unpack_action_data to use max stack buffer of 128

---
 contracts/eosiolib/action.hpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/contracts/eosiolib/action.hpp b/contracts/eosiolib/action.hpp
index b30c26b17..b216f8d0e 100644
--- a/contracts/eosiolib/action.hpp
+++ b/contracts/eosiolib/action.hpp
@@ -44,8 +44,10 @@ namespace eosio {
     */
    template<typename T>
    T unpack_action_data() {
-      char buffer[action_data_size()];
-      read_action_data( buffer, sizeof(buffer) );
+      constexpr size_t max_stack_buffer_size = 128;
+      size_t size = action_data_size();
+      char* buffer = (char*)( max_stack_buffer_size < size ? malloc(size) : alloca(size) );
+      read_action_data( buffer, size );
       return unpack<T>( buffer, sizeof(buffer) );
    }
 
-- 
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