From 2ece029fe03d0507b4b86d665a937573771cc121 Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.a.alekhin@gmail.com>
Date: Sun, 31 Mar 2019 11:50:33 +0000
Subject: [PATCH] imgcodecs(tiff): avoid leak of helper struct on malformed
 inputs

backporting of commit: 45428b897fa718ca44ac7834d6a1ee6f6b64a3f6
---
 modules/imgcodecs/src/grfmt_tiff.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/imgcodecs/src/grfmt_tiff.cpp b/modules/imgcodecs/src/grfmt_tiff.cpp
index 40295df088..7fa02562ad 100644
--- a/modules/imgcodecs/src/grfmt_tiff.cpp
+++ b/modules/imgcodecs/src/grfmt_tiff.cpp
@@ -214,6 +214,8 @@ bool TiffDecoder::readHeader()
                                   &TiffDecoderBufHelper::write, &TiffDecoderBufHelper::seek,
                                   &TiffDecoderBufHelper::close, &TiffDecoderBufHelper::size,
                                   &TiffDecoderBufHelper::map, /*unmap=*/0 );
+            if (!tif)
+                delete buf_helper;
         }
         else
         {