From e44143e1503836f1aba3d9aca471e4dea48ebd87 Mon Sep 17 00:00:00 2001
From: Peter Hillman <peterh@wetafx.co.nz>
Date: Mon, 17 Aug 2020 08:17:57 +1200
Subject: [PATCH] double-check unpackedBuffer created in DWA uncompress

Signed-off-by: Peter Hillman <peterh@wetafx.co.nz>
---
 OpenEXR/IlmImf/ImfDwaCompressor.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/OpenEXR/IlmImf/ImfDwaCompressor.cpp b/OpenEXR/IlmImf/ImfDwaCompressor.cpp
index 4eb4f06e54..da2d95068b 100644
--- a/OpenEXR/IlmImf/ImfDwaCompressor.cpp
+++ b/OpenEXR/IlmImf/ImfDwaCompressor.cpp
@@ -2535,7 +2535,7 @@ DwaCompressor::uncompress
 
     if (acCompressedSize > 0)
     {
-        if (totalAcUncompressedCount*sizeof(unsigned short) > _packedAcBufferSize)
+        if ( !_packedAcBuffer || totalAcUncompressedCount*sizeof(unsigned short) > _packedAcBufferSize)
         {
             throw IEX_NAMESPACE::InputExc("Error uncompressing DWA data"
                                 "(corrupt header).");