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Modify integrity-check to prevent a buffer overread when dealing with a corrupted database. (CVS 6411)

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FossilOrigin-Name: 3c9097f19adae071a12e1114f64993d0c1da1163
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danielk1977
2009-03-30 13:53:43 +00:00
parent a111577b6b
commit 5be31f519b
3 changed files with 12 additions and 10 deletions
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6
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.579 2009/03/28 10:54:23 danielk1977 Exp $
** $Id: btree.c,v 1.580 2009/03/30 13:53:43 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** See the header comment on "btreeInt.h" for additional information.
@@ -7107,7 +7107,9 @@ static int checkTreePage(
sz = info.nData;
if( !pPage->intKey ) sz += (int)info.nKey;
assert( sz==info.nPayload );
if( sz>info.nLocal ){
if( (sz>info.nLocal)
&& (&pCell[info.iOverflow]<=&pPage->aData[pBt->usableSize])
){
int nPage = (sz - info.nLocal + usableSize - 5)/(usableSize - 4);
Pgno pgnoOvfl = get4byte(&pCell[info.iOverflow]);
#ifndef SQLITE_OMIT_AUTOVACUUM