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Overview
| Comment: | Fix a double-free that can occur after database corruption is detected. (CVS 6921) |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
5260e8b1048af2e00d49706466d9aded |
| User & Date: | danielk1977 2009-07-22 14:08:14 |
Context
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2009-07-22
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| 16:41 | Avoid leaving a suspect page in the page-cache if an error occurs during sqlite3PagerAcquire(). (CVS 6922) check-in: 2594f01c user: danielk1977 tags: trunk | |
| 14:08 | Fix a double-free that can occur after database corruption is detected. (CVS 6921) check-in: 5260e8b1 user: danielk1977 tags: trunk | |
| 13:19 | Add a NEVER() macro around a pager.c conditional that must always be false in the current implementation. (CVS 6920) check-in: 1e510d7f user: drh tags: trunk | |
Changes
Changes to src/btree.c.
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** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: btree.c,v 1.698 2009/07/22 00:35:24 drh Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** See the header comment on "btreeInt.h" for additional information. ** Including a description of file format and an overview of operation. */ #include "btreeInt.h" ................................................................................ */ static int clearDatabasePage( BtShared *pBt, /* The BTree that contains the table */ Pgno pgno, /* Page number to clear */ int freePageFlag, /* Deallocate page if true */ int *pnChange ){ MemPage *pPage = 0; int rc; unsigned char *pCell; int i; assert( sqlite3_mutex_held(pBt->mutex) ); if( pgno>pagerPagecount(pBt) ){ return SQLITE_CORRUPT_BKPT; } rc = getAndInitPage(pBt, pgno, &pPage); if( rc ) goto cleardatabasepage_out; for(i=0; i<pPage->nCell; i++){ pCell = findCell(pPage, i); if( !pPage->leaf ){ rc = clearDatabasePage(pBt, get4byte(pCell), 1, pnChange); if( rc ) goto cleardatabasepage_out; } rc = clearCell(pPage, pCell); |
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** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** $Id: btree.c,v 1.699 2009/07/22 14:08:14 danielk1977 Exp $ ** ** This file implements a external (disk-based) database using BTrees. ** See the header comment on "btreeInt.h" for additional information. ** Including a description of file format and an overview of operation. */ #include "btreeInt.h" ................................................................................ */ static int clearDatabasePage( BtShared *pBt, /* The BTree that contains the table */ Pgno pgno, /* Page number to clear */ int freePageFlag, /* Deallocate page if true */ int *pnChange ){ MemPage *pPage; int rc; unsigned char *pCell; int i; assert( sqlite3_mutex_held(pBt->mutex) ); if( pgno>pagerPagecount(pBt) ){ return SQLITE_CORRUPT_BKPT; } rc = getAndInitPage(pBt, pgno, &pPage); if( rc ) return rc; for(i=0; i<pPage->nCell; i++){ pCell = findCell(pPage, i); if( !pPage->leaf ){ rc = clearDatabasePage(pBt, get4byte(pCell), 1, pnChange); if( rc ) goto cleardatabasepage_out; } rc = clearCell(pPage, pCell); |