From 2978a16c859dafab2bb75e95fc66229ffc8c4571 Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.alekhin@itseez.com>
Date: Tue, 26 Jan 2016 13:59:10 +0300
Subject: [PATCH] core: preserve sizes values (fixes #5991)

_sizes can point to internal structure which is destroyed
by release() call
---
 modules/core/src/matrix.cpp  | 15 +++++++++++++++
 modules/core/src/umatrix.cpp |  8 ++++++++
 2 files changed, 23 insertions(+)

diff --git a/modules/core/src/matrix.cpp b/modules/core/src/matrix.cpp
index 4a260eb646..08c5501e4e 100644
--- a/modules/core/src/matrix.cpp
+++ b/modules/core/src/matrix.cpp
@@ -397,6 +397,14 @@ void Mat::create(int d, const int* _sizes, int _type)
             return;
     }
 
+    int _sizes_backup[CV_MAX_DIM]; // #5991
+    if (_sizes == (this->size.p))
+    {
+        for(i = 0; i < d; i++ )
+            _sizes_backup[i] = _sizes[i];
+        _sizes = _sizes_backup;
+    }
+
     release();
     if( d == 0 )
         return;
@@ -4899,6 +4907,13 @@ void SparseMat::create(int d, const int* _sizes, int _type)
             return;
         }
     }
+    int _sizes_backup[CV_MAX_DIM]; // #5991
+    if (_sizes == hdr->size)
+    {
+        for(i = 0; i < d; i++ )
+            _sizes_backup[i] = _sizes[i];
+        _sizes = _sizes_backup;
+    }
     release();
     flags = MAGIC_VAL | _type;
     hdr = new Hdr(d, _sizes, _type);
diff --git a/modules/core/src/umatrix.cpp b/modules/core/src/umatrix.cpp
index 98d6b8c589..958723b7b5 100644
--- a/modules/core/src/umatrix.cpp
+++ b/modules/core/src/umatrix.cpp
@@ -345,6 +345,14 @@ void UMat::create(int d, const int* _sizes, int _type, UMatUsageFlags _usageFlag
             return;
     }
 
+    int _sizes_backup[CV_MAX_DIM]; // #5991
+    if (_sizes == (this->size.p))
+    {
+        for(i = 0; i < d; i++ )
+            _sizes_backup[i] = _sizes[i];
+        _sizes = _sizes_backup;
+    }
+
     release();
     if( d == 0 )
         return;