Bug fix: When the database file grows in size during a transaction, make sure

the last page of the file gets written to disk even if that page is on the
free list and contains no data.  Otherwise the disk file will be too small
which can lead to database corruption in subsequent transactions. (CVS 643)

FossilOrigin-Name: 36fc0add660f9f3676783765d37280aa874caecb

VERSION

@@ -1 +1 @@
-2.5.2
+2.5.3

manifest

@@ -1,9 +1,9 @@
-C Enhance\sthe\sINTEGRITY_CHECK\spragma\sto\stest\sthe\sauxiliary\sdatabase\sfile\sin\naddition\sto\sthe\smain\sdatabase\sfile.\s(CVS\s642)
-D 2002-06-25T13:16:03
+C Bug\sfix:\sWhen\sthe\sdatabase\sfile\sgrows\sin\ssize\sduring\sa\stransaction,\smake\ssure\nthe\slast\spage\sof\sthe\sfile\sgets\swritten\sto\sdisk\seven\sif\sthat\spage\sis\son\sthe\nfree\slist\sand\scontains\sno\sdata.\s\sOtherwise\sthe\sdisk\sfile\swill\sbe\stoo\ssmall\nwhich\scan\slead\sto\sdatabase\scorruption\sin\ssubsequent\stransactions.\s(CVS\s643)
+D 2002-06-25T14:43:58
 F Makefile.in 6291a33b87d2a395aafd7646ee1ed562c6f2c28c
 F Makefile.template 4e11752e0b5c7a043ca50af4296ec562857ba495
 F README a4c0ba11354ef6ba0776b400d057c59da47a4cc0
-F VERSION 2ca20d4461e9496d4ae27191e7273a12369ff17c
+F VERSION 97bfa91ca72b5d914131a988ca9b75bc52c40553
 F aclocal.m4 11faa843caa38fd451bc6aeb43e248d1723a269d
 F config.guess f38b1e93d1e0fa6f5a6913e9e7b12774b9232588
 F config.sub f14b07d544ca26b5d698259045136b783e18fc7f
@@ -32,7 +32,7 @@ F src/main.c 43d5f4e38108129a13cf42c59087e6e20b3596ad
 F src/md5.c 0ae1f3e2cac92d06fc6246d1b4b8f61a2fe66d3b
 F src/os.c 9cc40c5384baba4a85e160e67807645ca98ba3cc
 F src/os.h 4a361fccfbc4e7609b3e1557f604f94c1e96ad10
-F src/pager.c 1e41053c949cea1f09d8dafada5fe8f90785e650
+F src/pager.c 58ae9f569b3c664ea9205c6f6da432e3ae180f56
 F src/pager.h 6fddfddd3b73aa8abc081b973886320e3c614f0e
 F src/parse.y c75ea2580de675bcb80ff8b7c10c0a15e02a21ab
 F src/printf.c 236ed7a79386feed4456fa728fff8be793f1547c
@@ -122,7 +122,7 @@ F www/arch.fig d5f9752a4dbf242e9cfffffd3f5762b6c63b3bcf
 F www/arch.png 82ef36db1143828a7abc88b1e308a5f55d4336f4
 F www/arch.tcl 72a0c80e9054cc7025a50928d28d9c75c02c2b8b
 F www/c_interface.tcl 58cf4d128dcae08d91d0011c6d4d11de323f470f
-F www/changes.tcl 08de0b1b50d3651ac3bd6b0d44c9ebe0072b55b3
+F www/changes.tcl a096bde48589a4c1fae69e85d72d3c41fdd186cd
 F www/conflict.tcl 81dd21f9a679e60aae049e9dd8ab53d59570cda2
 F www/crosscompile.tcl 3622ebbe518927a3854a12de51344673eb2dd060
 F www/download.tcl 29aa6679ca29621d10613f60ebbbda18f4b91c49
@@ -137,7 +137,7 @@ F www/speed.tcl da8afcc1d3ccc5696cfb388a68982bc3d9f7f00f
 F www/sqlite.tcl ac64065d0c5e2de0f71238d55b2c14bb5c5c194c
 F www/tclsqlite.tcl 1db15abeb446aad0caf0b95b8b9579720e4ea331
 F www/vdbe.tcl 2013852c27a02a091d39a766bc87cff329f21218
-P 756310cad23668785eac679ef0842d1f37c306ee
-R 86bdc4dd43fde89d9869884f7454049a
+P 52eba4de301121f254174b74042015bf6069ef11
+R 40d3bf2fd98ee726a822a60d13e6ec24
 U drh
-Z 4de554b1388a65f2a11731d055d158e3
+Z a933713559c7d8b5cd51a8205ff4246e

manifest.uuid

@@ -1 +1 @@
-52eba4de301121f254174b74042015bf6069ef11
+36fc0add660f9f3676783765d37280aa874caecb

src/pager.c

@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.46 2002/05/30 12:27:03 drh Exp $
+** @(#) $Id: pager.c,v 1.47 2002/06/25 14:43:58 drh Exp $
 */
 #include "sqliteInt.h"
 #include "pager.h"
@@ -1195,7 +1195,18 @@ void sqlitepager_dont_write(Pager *pPager, Pgno pgno){
   PgHdr *pPg;
   pPg = pager_lookup(pPager, pgno);
   if( pPg && pPg->dirty ){
-    pPg->dirty = 0;
+    if( pPager->dbSize==(int)pPg->pgno && pPager->origDbSize<pPager->dbSize ){
+      /* If this pages is the last page in the file and the file has grown
+      ** during the current transaction, then do NOT mark the page as clean.
+      ** When the database file grows, we must make sure that the last page
+      ** gets written at least once so that the disk file will be the correct
+      ** size. If you do not write this page and the size of the file
+      ** on the disk ends up being too small, that can lead to database
+      ** corruption during the next transaction.
+      */
+    }else{
+      pPg->dirty = 0;
+    }
   }
 }
 

www/changes.tcl

@@ -25,6 +25,13 @@ proc chng {date desc} {
   puts "<DD><P><UL>$desc</UL></P></DD>"
 }
 
+chng {2002 Jun 24 (2.5.3)} {
+<li>Bug fix:  Database corruption can occur due to the optimization
+    that was introduced in version 2.4.0 (checking [410]).  The problem
+    should now be fixed.  The use of versions 2.4.0 through 2.5.2 is
+    not recommended.</li>
+}
+
 chng {2002 Jun 24 (2.5.2)} {
 <li>Added the new <b>SQLITE_TEMP_MASTER</b> table which records the schema
     for temporary tables in the same way that <b>SQLITE_MASTER</b> does for