From 1de5fc1419add86884df97580d7a2e745ad43bff Mon Sep 17 00:00:00 2001
From: Simon Warta <simon@warta.it>
Date: Mon, 29 Jun 2015 14:02:37 +0200
Subject: More changes for use with debug STL

---
 src/lib/mac/poly1305/poly1305.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/lib/mac/poly1305/poly1305.cpp')

diff --git a/src/lib/mac/poly1305/poly1305.cpp b/src/lib/mac/poly1305/poly1305.cpp
index 545a749fa..506150b0f 100644
--- a/src/lib/mac/poly1305/poly1305.cpp
+++ b/src/lib/mac/poly1305/poly1305.cpp
@@ -190,7 +190,11 @@ void Poly1305::final_result(byte out[])
    if(m_buf_pos != 0)
       {
       m_buf[m_buf_pos] = 1;
-      clear_mem(&m_buf[m_buf_pos+1], m_buf.size() - m_buf_pos - 1);
+      const auto len = m_buf.size() - m_buf_pos - 1;
+      if (len > 0)
+         {
+         clear_mem(&m_buf[m_buf_pos+1], len);
+         }
       poly1305_blocks(m_poly, m_buf.data(), 1, true);
       }
 
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