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Overview
| Comment: | Fix a one byte buffer overread in fts3. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
6e3e014af91601ed1f3a9cbe23f7c426 |
| User & Date: | dan 2010-03-05 17:27:02 |
Context
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2010-03-05
| ||
| 18:46 | Change a condition in sqlite3VdbeMemShallowCopy() to avoid accessing an unitialized variable (doing so was not dangerous, but caused a valgrind error). check-in: 4793c381c6 user: dan tags: trunk | |
| 17:27 | Fix a one byte buffer overread in fts3. check-in: 6e3e014af9 user: dan tags: trunk | |
| 16:32 | Modify the vdbe so that the comparison operator opcodes do not modify the data type of operands. Fix for [aa92c76cd4]. check-in: 8858042fa1 user: dan tags: trunk | |
Changes
Changes to ext/fts3/fts3.c.
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assert( iVal-*piPrev > 0 || (*piPrev==0 && iVal==0) );
*pp += sqlite3Fts3PutVarint(*pp, iVal-*piPrev);
*piPrev = iVal;
}
/*
** When this function is called, *ppPoslist is assumed to point to the
** start of a position-list.
*/
static void fts3PoslistCopy(char **pp, char **ppPoslist){
char *pEnd = *ppPoslist;
char c = 0;
/* The end of a position list is marked by a zero encoded as an FTS3
** varint. A single 0x00 byte. Except, if the 0x00 byte is preceded by
................................................................................
char *pEnd = &pExpr->aDoclist[pExpr->nDoclist];
char *pCsr = pExpr->pCurrent;
assert( pCsr );
while( pCsr<pEnd ){
if( pExpr->iCurrent<iDocid ){
fts3PoslistCopy(0, &pCsr);
fts3GetDeltaVarint(&pCsr, &pExpr->iCurrent);
pExpr->pCurrent = pCsr;
}else{
if( pExpr->iCurrent==iDocid ){
int iThis = 0;
if( iCol<0 ){
/* If iCol is negative, return a pointer to the start of the
** position-list (instead of a pointer to the start of a list
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assert( iVal-*piPrev > 0 || (*piPrev==0 && iVal==0) ); *pp += sqlite3Fts3PutVarint(*pp, iVal-*piPrev); *piPrev = iVal; } /* ** When this function is called, *ppPoslist is assumed to point to the ** start of a position-list. After it returns, *ppPoslist points to the ** first byte after the position-list. ** ** If pp is not NULL, then the contents of the position list are copied ** to *pp. *pp is set to point to the first byte past the last byte copied ** before this function returns. */ static void fts3PoslistCopy(char **pp, char **ppPoslist){ char *pEnd = *ppPoslist; char c = 0; /* The end of a position list is marked by a zero encoded as an FTS3 ** varint. A single 0x00 byte. Except, if the 0x00 byte is preceded by ................................................................................ char *pEnd = &pExpr->aDoclist[pExpr->nDoclist]; char *pCsr = pExpr->pCurrent; assert( pCsr ); while( pCsr<pEnd ){ if( pExpr->iCurrent<iDocid ){ fts3PoslistCopy(0, &pCsr); if( pCsr<pEnd ){ fts3GetDeltaVarint(&pCsr, &pExpr->iCurrent); } pExpr->pCurrent = pCsr; }else{ if( pExpr->iCurrent==iDocid ){ int iThis = 0; if( iCol<0 ){ /* If iCol is negative, return a pointer to the start of the ** position-list (instead of a pointer to the start of a list |