From 703136096f4d9f0f5360a1b8937413442568f994 Mon Sep 17 00:00:00 2001
From: Peter Hillman <peterh@wetafx.co.nz>
Date: Fri, 12 Jul 2019 18:31:01 +1200
Subject: [PATCH] address #271: catch scanlines with negative sizes

---
 OpenEXR/IlmImf/ImfScanLineInputFile.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/OpenEXR/IlmImf/ImfScanLineInputFile.cpp b/OpenEXR/IlmImf/ImfScanLineInputFile.cpp
index a6620c7fc7..4bd650a064 100644
--- a/OpenEXR/IlmImf/ImfScanLineInputFile.cpp
+++ b/OpenEXR/IlmImf/ImfScanLineInputFile.cpp
@@ -429,8 +429,8 @@ readPixelData (InputStreamMutex *streamData,
     if (yInFile != minY)
         throw IEX_NAMESPACE::InputExc ("Unexpected data block y coordinate.");
 
-    if (dataSize > (int) ifd->lineBufferSize)
-	throw IEX_NAMESPACE::InputExc ("Unexpected data block length.");
+    if (dataSize < 0 || dataSize > static_cast<int>(ifd->lineBufferSize) )
+        throw IEX_NAMESPACE::InputExc ("Unexpected data block length.");
 
     //
     // Read the pixel data.