From ddac4345ad8574b1069cb0c84fa0ebf740c96f37 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Sat, 13 Jan 2018 08:40:40 +0300
Subject: [PATCH] Addition to prev. revision #1665

---
 dbms/src/IO/readFloatText.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/dbms/src/IO/readFloatText.h b/dbms/src/IO/readFloatText.h
index e39992a586..c14b7c4bcf 100644
--- a/dbms/src/IO/readFloatText.h
+++ b/dbms/src/IO/readFloatText.h
@@ -201,12 +201,15 @@ void readIntTextUpToNChars(T & x, ReadBuffer & buf)
         negative = true;
     }
 
-    for (size_t i = 0; !buf.eof() && i < N; ++i)
+    for (size_t i = 0; !buf.eof(); ++i)
     {
         if ((*buf.position() & 0xF0) == 0x30)
         {
-            x *= 10;
-            x += *buf.position() & 0x0F;
+            if (likely(i < N))
+            {
+                x *= 10;
+                x += *buf.position() & 0x0F;
+            }
             ++buf.position();
         }
         else
-- 
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