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Verify that the sqlite_sequence table exists and is in approximately the

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correct format prior to using it to process an autoincrement table.
Fix for ticket [d8dc2b3a58cd5dc2918a1d4a].

FossilOrigin-Name: e199e859ace4f8381c6380175206e7a276e3f2228fadbbca9341bca8d2fc445d
This commit is contained in:
drh
2018-05-23 16:50:21 +00:00
parent e8cf689df3
commit 186ebd41cf
5 changed files with 180 additions and 10 deletions
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15
src/insert.c
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@@ -226,11 +226,26 @@ static int autoIncBegin(
Table *pTab /* The table we are writing to */
){
int memId = 0; /* Register holding maximum rowid */
assert( pParse->db->aDb[iDb].pSchema!=0 );
if( (pTab->tabFlags & TF_Autoincrement)!=0
&& (pParse->db->mDbFlags & DBFLAG_Vacuum)==0
){
Parse *pToplevel = sqlite3ParseToplevel(pParse);
AutoincInfo *pInfo;
Table *pSeqTab = pParse->db->aDb[iDb].pSchema->pSeqTab;
/* Verify that the sqlite_sequence table exists and is an ordinary
** rowid table with exactly two columns.
** Ticket d8dc2b3a58cd5dc2918a1d4acb 2018-05-23 */
if( pSeqTab==0
|| !HasRowid(pSeqTab)
|| IsVirtual(pSeqTab)
|| pSeqTab->nCol!=2
){
pParse->nErr++;
pParse->rc = SQLITE_CORRUPT_SEQUENCE;
return 0;
}
pInfo = pToplevel->pAinc;
while( pInfo && pInfo->pTab!=pTab ){ pInfo = pInfo->pNext; }