From 80df9ddedb0d4f7c3d401ebbd8663300c4c35157 Mon Sep 17 00:00:00 2001
From: jiakai <jia.kai66@gmail.com>
Date: Thu, 5 Nov 2015 18:32:51 +0800
Subject: [PATCH] check for exifSize

---
 modules/imgcodecs/src/jpeg_exif.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/imgcodecs/src/jpeg_exif.cpp b/modules/imgcodecs/src/jpeg_exif.cpp
index 142a079f0e..af4b7a9908 100644
--- a/modules/imgcodecs/src/jpeg_exif.cpp
+++ b/modules/imgcodecs/src/jpeg_exif.cpp
@@ -158,6 +158,9 @@ std::map<int, ExifEntry_t > ExifReader::getExif()
 
             case APP1: //actual Exif Marker
                 exifSize = getFieldSize(f);
+                if (exifSize <= offsetToTiffHeader) {
+                    throw ExifParsingError();
+                }
                 m_data.resize( exifSize - offsetToTiffHeader );
                 fseek(f, static_cast<long>( offsetToTiffHeader ), SEEK_CUR);
                 count = fread( &m_data[0], sizeof( unsigned char ), exifSize - offsetToTiffHeader, f );