From 9172fd8cd0f3c381ff876eda6dba5638ce53350e Mon Sep 17 00:00:00 2001
From: danielk1977 <danielk1977@noemail.net>
Date: Thu, 14 Feb 2008 15:31:52 +0000
Subject: [PATCH] Fix some VdbeMemCopy() related problems. (CVS 4787)

FossilOrigin-Name: aca2bee8662c3adaa47b3e70b1ef35347111f9eb
---
 manifest      | 14 +++++++-------
 manifest.uuid |  2 +-
 src/mem3.c    | 12 ++++++++----
 src/vdbemem.c | 10 ++++++----
 4 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/manifest b/manifest
index 626a3b9802..837da849af 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sa\sproblem\sin\sthe\sptrchng.test\sscript.\s(CVS\s4786)
-D 2008-02-14T05:44:45
+C Fix\ssome\sVdbeMemCopy()\srelated\sproblems.\s(CVS\s4787)
+D 2008-02-14T15:31:52
 F Makefile.arm-wince-mingw32ce-gcc ac5f7b2cef0cd850d6f755ba6ee4ab961b1fadf7
 F Makefile.in bc2b5df3e3d0d4b801b824b7ef6dec43812b049b
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -107,7 +107,7 @@ F src/malloc.c 60e392a4c12c839517f9b0db7b995f825444fb35
 F src/md5.c c5fdfa5c2593eaee2e32a5ce6c6927c986eaf217
 F src/mem1.c b15e107d51bdd4bcf410c18798ee48bee4768d4e
 F src/mem2.c ed0cb11ae43a3cc92bfb07172c2801956e94eaba
-F src/mem3.c cf1bf5b2f9d4d76e465c84c0607f6882d3b1b522
+F src/mem3.c 4ca65028bd5aabebc087cd29ab2ac1c10ce6a0d4
 F src/mem4.c 36ecd536a8b7acfe4cbf011353dae6ea68121e40
 F src/mutex.c 3259f62c2429967aee6dc112117a6d2f499ef061
 F src/mutex.h 079fa6fe9da18ceb89e79012c010594c6672addb
@@ -177,7 +177,7 @@ F src/vdbeapi.c cf9fc963efae3cdf5de08e2a9718b487059c7fc5
 F src/vdbeaux.c 36d4db24659146606a1c755650f2a70cf88eec25
 F src/vdbeblob.c 63c750acc7b5012479f508c0e9627372a82cb65d
 F src/vdbefifo.c 334c838c8f42d61a94813d136019ee566b5dc2f6
-F src/vdbemem.c e060d04bc6f8cf32c638fddada266b01cad8ee9a
+F src/vdbemem.c 73a4dd9e4ac185d7582486585cdc501f6b832dcb
 F src/vtab.c dc8947c9c79780b19ee6d6bae4ea624a2a303353
 F src/where.c 7ff0ca021cc77086e367ed3b6308fbc6bc9e1a31
 F tclinstaller.tcl 4356d9d94d2b5ed5e68f9f0c80c4df3048dd7617
@@ -617,7 +617,7 @@ F www/tclsqlite.tcl 8be95ee6dba05eabcd27a9d91331c803f2ce2130
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
-P f364d9342345cb11a4fd1961ab4f6387fb6abacc
-R eb0b80c339e37039f409d82928c61946
+P 30a45f078421bc89da9218528110e3bd90054bbf
+R 163aea8d5ee05b32aa9b90b719599c4c
 U danielk1977
-Z 78b86b5f54534f0aee0791249642430b
+Z f9c60c6b01c0aaa4a339262c14d0294b
diff --git a/manifest.uuid b/manifest.uuid
index f4ce7f74c2..7908272adb 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-30a45f078421bc89da9218528110e3bd90054bbf
\ No newline at end of file
+aca2bee8662c3adaa47b3e70b1ef35347111f9eb
\ No newline at end of file
diff --git a/src/mem3.c b/src/mem3.c
index 05b35ad891..2d50931ef1 100644
--- a/src/mem3.c
+++ b/src/mem3.c
@@ -20,7 +20,7 @@
 ** This version of the memory allocation subsystem is used if
 ** and only if SQLITE_MEMORY_SIZE is defined.
 **
-** $Id: mem3.c,v 1.9 2008/02/13 18:25:27 danielk1977 Exp $
+** $Id: mem3.c,v 1.10 2008/02/14 15:31:52 danielk1977 Exp $
 */
 
 /*
@@ -292,9 +292,13 @@ static void memsys3OutOfMemory(int nByte){
 ** works for chunks that are currently checked out.
 */
 int sqlite3MallocSize(void *p){
-  Mem3Block *pBlock = (Mem3Block*)p;
-  assert( (pBlock[-1].u.hdr.size4x&1)!=0 );
-  return (pBlock[-1].u.hdr.size4x&~3)*2 - 4;
+  int iSize = 0;
+  if( p ){
+    Mem3Block *pBlock = (Mem3Block*)p;
+    assert( (pBlock[-1].u.hdr.size4x&1)!=0 );
+    iSize = (pBlock[-1].u.hdr.size4x&~3)*2 - 4;
+  }
+  return iSize;
 }
 
 /*
diff --git a/src/vdbemem.c b/src/vdbemem.c
index d620aa2e55..7462b2640c 100644
--- a/src/vdbemem.c
+++ b/src/vdbemem.c
@@ -540,10 +540,12 @@ int sqlite3VdbeMemCopy(Mem *pTo, const Mem *pFrom){
   ** in local variable zBuf. This function attempts to avoid freeing
   ** this buffer.
   */
-  if( pTo->xDel ){
-    sqlite3VdbeMemRelease(pTo);
-  }else if( pTo->flags&MEM_Dyn ){
-    zBuf = pTo->z;
+  if( pTo->flags&MEM_Dyn ){
+    if( pTo->xDel ){
+      sqlite3VdbeMemRelease(pTo);
+    }else{
+      zBuf = pTo->z;
+    }
   }
 
   /* Copy the contents of *pFrom to *pTo */