From 02d1f1cc579d9d2f395ba3e10309d17a636b797a Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@icinga.com>
Date: Wed, 20 Jun 2018 09:59:18 +0200
Subject: [PATCH] Stream#ReadLine(): fix false positive buffer underflow
 indicator

refs #6354
---
 lib/base/stream.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/base/stream.cpp b/lib/base/stream.cpp
index 3048f096c..a7ac2067c 100644
--- a/lib/base/stream.cpp
+++ b/lib/base/stream.cpp
@@ -143,7 +143,16 @@ StreamReadStatus Stream::ReadLine(String *line, StreamReadContext& context, bool
 		}
 	}
 
-	context.MustRead = (count <= 1);
+	switch (count) {
+		case 0:
+			context.MustRead = true;
+			break;
+		case 1:
+			context.MustRead = first_newline == (context.Size - 1u);
+			break;
+		default:
+			context.MustRead = false;
+	}
 
 	if (count > 0) {
 		*line = String(context.Buffer, &(context.Buffer[first_newline]));
-- 
2.40.0