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Zero cached pages located beyond the end of the file before returning them. Ticket #2285. (CVS 3808)

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FossilOrigin-Name: 5180810eeaa3dfe3d934af0732a920ae117ec69f
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danielk1977
2007-04-05 05:46:14 +00:00
parent 5f9c1a2cbd
commit 2026cefaf8
4 changed files with 75 additions and 9 deletions
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10
src/pager.c
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@@ -18,7 +18,7 @@
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.316 2007/04/02 11:22:22 drh Exp $
** @(#) $Id: pager.c,v 1.317 2007/04/05 05:46:14 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
@@ -3028,6 +3028,14 @@ int sqlite3PagerAcquire(Pager *pPager, Pgno pgno, DbPage **ppPage, int clrFlag){
}else{
/* The requested page is in the page cache. */
assert(pPager->nRef>0 || pgno==1);
if( pgno>sqlite3PagerPagecount(pPager) ){
/* This can happen after a truncation in exclusive mode. The pager
** cache contains pages that are located after the end of the
** database file. Zero such pages before returning. Not doing this
** was causing the problem reported in ticket #2285.
*/
memset(PGHDR_TO_DATA(pPg), 0, pPager->pageSize);
}
TEST_INCR(pPager->nHit);
page_ref(pPg);
}