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Overview
| Comment: | Fix some cases in the fts5 code where a corrupt database could cause a buffer overread. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | fts5 |
| Files: | files | file ages | folders |
| SHA1: |
360c57bbb8bad6cc84af140f61e0282f |
| User & Date: | dan 2015-06-26 18:50:29 |
Context
|
2015-06-26
| ||
| 19:33 | Merge latest trunk changes with this branch. check-in: 2a1af0f2 user: dan tags: fts5 | |
| 18:50 | Fix some cases in the fts5 code where a corrupt database could cause a buffer overread. check-in: 360c57bb user: dan tags: fts5 | |
| 17:10 | Merge changes to get FTS5 working with MSVC. check-in: 954231d2 user: mistachkin tags: fts5 | |
Changes
Changes to ext/fts5/fts5_index.c.
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}else{
iOff = 0;
/* Next entry is not on the current page */
while( iOff==0 ){
fts5SegIterNextPage(p, pIter);
pLeaf = pIter->pLeaf;
if( pLeaf==0 ) break;
if( (iOff = fts5GetU16(&pLeaf->p[0])) ){
iOff += sqlite3Fts5GetVarint(&pLeaf->p[iOff], (u64*)&pIter->iRowid);
pIter->iLeafOffset = iOff;
}
else if( (iOff = fts5GetU16(&pLeaf->p[2])) ){
pIter->iLeafOffset = iOff;
bNewTerm = 1;
}
}
}
/* Check if the iterator is now at EOF. If so, return early. */
if( pIter->pLeaf ){
if( bNewTerm ){
................................................................................
Fts5StructureSegment *pSeg, /* Description of segment */
Fts5SegIter *pIter /* Object to populate */
){
int iPg = 1;
int h;
int bGe = (flags & FTS5INDEX_QUERY_SCAN);
int bDlidx = 0; /* True if there is a doclist-index */
assert( bGe==0 || (flags & FTS5INDEX_QUERY_DESC)==0 );
assert( pTerm && nTerm );
memset(pIter, 0, sizeof(*pIter));
pIter->pSeg = pSeg;
/* This block sets stack variable iPg to the leaf page number that may
................................................................................
iPg = pSeg->pgnoFirst;
bDlidx = 0;
}
pIter->iLeafPgno = iPg - 1;
fts5SegIterNextPage(p, pIter);
if( pIter->pLeaf ){
int res;
pIter->iLeafOffset = fts5GetU16(&pIter->pLeaf->p[2]);
fts5SegIterLoadTerm(p, pIter, 0);
fts5SegIterLoadNPos(p, pIter);
do {
res = fts5BufferCompareBlob(&pIter->term, pTerm, nTerm);
if( res>=0 ) break;
fts5SegIterNext(p, pIter, 0);
}while( pIter->pLeaf && p->rc==SQLITE_OK );
................................................................................
if( bGe==0 && res ){
/* Set iterator to point to EOF */
fts5DataRelease(pIter->pLeaf);
pIter->pLeaf = 0;
}
}
if( p->rc==SQLITE_OK && bGe==0 ){
pIter->flags |= FTS5_SEGITER_ONETERM;
if( pIter->pLeaf ){
if( flags & FTS5INDEX_QUERY_DESC ){
pIter->flags |= FTS5_SEGITER_REVERSE;
}
................................................................................
int bSkipEmpty, /* True to ignore delete-keys */
int flags, /* FTS5INDEX_QUERY_XXX flags */
const u8 *pTerm, int nTerm, /* Term to seek to (or NULL/0) */
int iLevel, /* Level to iterate (-1 for all) */
int nSegment, /* Number of segments to merge (iLevel>=0) */
Fts5MultiSegIter **ppOut /* New object */
){
int nSeg; /* Number of segment-iters in use */
int iIter = 0; /* */
int iSeg; /* Used to iterate through segments */
Fts5StructureLevel *pLvl;
Fts5MultiSegIter *pNew;
assert( (pTerm==0 && nTerm==0) || iLevel<0 );
................................................................................
/* Check that the leaf page indicated by the iterator really does
** contain the rowid suggested by the same. */
iKey = FTS5_SEGMENT_ROWID(iSegid, 0, iPrevLeaf);
pLeaf = fts5DataRead(p, iKey);
if( pLeaf ){
i64 iRowid;
int iRowidOff = fts5GetU16(&pLeaf->p[0]);
fts5GetVarint(&pLeaf->p[iRowidOff], (u64*)&iRowid);
if( iRowid!=fts5DlidxIterRowid(pDlidx) ) p->rc = FTS5_CORRUPT;
fts5DataRelease(pLeaf);
}
}
for(iPg=iPrevLeaf+1; iPg<=(iter.iLeaf + iter.nEmpty); iPg++){
iKey = FTS5_SEGMENT_ROWID(iSegid, 0, iPg);
pLeaf = fts5DataRead(p, iKey);
|
| > > > > > | | > > > > | > > > | | > |
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}else{
iOff = 0;
/* Next entry is not on the current page */
while( iOff==0 ){
fts5SegIterNextPage(p, pIter);
pLeaf = pIter->pLeaf;
if( pLeaf==0 ) break;
if( (iOff = fts5GetU16(&pLeaf->p[0])) && iOff<pLeaf->n ){
iOff += sqlite3Fts5GetVarint(&pLeaf->p[iOff], (u64*)&pIter->iRowid);
pIter->iLeafOffset = iOff;
}
else if( (iOff = fts5GetU16(&pLeaf->p[2])) ){
pIter->iLeafOffset = iOff;
bNewTerm = 1;
}
if( iOff>=pLeaf->n ){
p->rc = FTS5_CORRUPT;
return;
}
}
}
/* Check if the iterator is now at EOF. If so, return early. */
if( pIter->pLeaf ){
if( bNewTerm ){
................................................................................
Fts5StructureSegment *pSeg, /* Description of segment */
Fts5SegIter *pIter /* Object to populate */
){
int iPg = 1;
int h;
int bGe = (flags & FTS5INDEX_QUERY_SCAN);
int bDlidx = 0; /* True if there is a doclist-index */
Fts5Data *pLeaf;
assert( bGe==0 || (flags & FTS5INDEX_QUERY_DESC)==0 );
assert( pTerm && nTerm );
memset(pIter, 0, sizeof(*pIter));
pIter->pSeg = pSeg;
/* This block sets stack variable iPg to the leaf page number that may
................................................................................
iPg = pSeg->pgnoFirst;
bDlidx = 0;
}
pIter->iLeafPgno = iPg - 1;
fts5SegIterNextPage(p, pIter);
if( (pLeaf = pIter->pLeaf) ){
int res;
pIter->iLeafOffset = fts5GetU16(&pLeaf->p[2]);
if( pIter->iLeafOffset<4 || pIter->iLeafOffset>=pLeaf->n ){
p->rc = FTS5_CORRUPT;
}else{
fts5SegIterLoadTerm(p, pIter, 0);
fts5SegIterLoadNPos(p, pIter);
do {
res = fts5BufferCompareBlob(&pIter->term, pTerm, nTerm);
if( res>=0 ) break;
fts5SegIterNext(p, pIter, 0);
}while( pIter->pLeaf && p->rc==SQLITE_OK );
................................................................................
if( bGe==0 && res ){
/* Set iterator to point to EOF */
fts5DataRelease(pIter->pLeaf);
pIter->pLeaf = 0;
}
}
}
if( p->rc==SQLITE_OK && bGe==0 ){
pIter->flags |= FTS5_SEGITER_ONETERM;
if( pIter->pLeaf ){
if( flags & FTS5INDEX_QUERY_DESC ){
pIter->flags |= FTS5_SEGITER_REVERSE;
}
................................................................................
int bSkipEmpty, /* True to ignore delete-keys */
int flags, /* FTS5INDEX_QUERY_XXX flags */
const u8 *pTerm, int nTerm, /* Term to seek to (or NULL/0) */
int iLevel, /* Level to iterate (-1 for all) */
int nSegment, /* Number of segments to merge (iLevel>=0) */
Fts5MultiSegIter **ppOut /* New object */
){
int nSeg = 0; /* Number of segment-iters in use */
int iIter = 0; /* */
int iSeg; /* Used to iterate through segments */
Fts5StructureLevel *pLvl;
Fts5MultiSegIter *pNew;
assert( (pTerm==0 && nTerm==0) || iLevel<0 );
................................................................................
/* Check that the leaf page indicated by the iterator really does
** contain the rowid suggested by the same. */
iKey = FTS5_SEGMENT_ROWID(iSegid, 0, iPrevLeaf);
pLeaf = fts5DataRead(p, iKey);
if( pLeaf ){
i64 iRowid;
int iRowidOff = fts5GetU16(&pLeaf->p[0]);
if( iRowidOff>=pLeaf->n ){
p->rc = FTS5_CORRUPT;
}else{
fts5GetVarint(&pLeaf->p[iRowidOff], (u64*)&iRowid);
if( iRowid!=fts5DlidxIterRowid(pDlidx) ) p->rc = FTS5_CORRUPT;
}
fts5DataRelease(pLeaf);
}
}
for(iPg=iPrevLeaf+1; iPg<=(iter.iLeaf + iter.nEmpty); iPg++){
iKey = FTS5_SEGMENT_ROWID(iSegid, 0, iPg);
pLeaf = fts5DataRead(p, iKey);
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