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Add more corruption checking to the cell overwrite logic.

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FossilOrigin-Name: 58d14afe1e1288d114ea213458b3121e0a95670887861928858b7f143c76f789
This commit is contained in:
drh
2018-05-03 13:56:23 +00:00
parent 9b03192e15
commit 4f84e9c7e2
3 changed files with 13 additions and 7 deletions
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6
src/btree.c
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@@ -8201,6 +8201,9 @@ static int btreeOverwriteCell(BtCursor *pCur, const BtreePayload *pX){
Pgno ovflPgno; /* Next overflow page to write */
u32 ovflPageSize; /* Size to write on overflow page */
if( pCur->info.pPayload + pCur->info.nLocal > pPage->aDataEnd ){
return SQLITE_CORRUPT_BKPT;
}
/* Overwrite the local portion first */
rc = btreeOverwriteContent(pPage, pCur->info.pPayload, pX,
0, pCur->info.nLocal);
@@ -8215,6 +8218,9 @@ static int btreeOverwriteCell(BtCursor *pCur, const BtreePayload *pX){
do{
rc = btreeGetPage(pBt, ovflPgno, &pPage, 0);
if( rc ) return rc;
if( sqlite3PagerPageRefcount(pPage->pDbPage)!=1 ){
return SQLITE_CORRUPT_BKPT;
}
if( iOffset+ovflPageSize<nTotal ){
ovflPgno = get4byte(pPage->aData);
}else{