database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-07-29 08:01:23 +03:00
Code Activity

Avoid signed integer overflow when finding snippets in fts3 by using 64-bit integer offsets.

Browse Source 
FossilOrigin-Name: 4cc09a872f627f4a2b94345bef07cd49c3ec3627f8d78c1eb091741cdb4ec0b3
This commit is contained in:
dan
2021-04-16 16:55:28 +00:00
parent 197561cd42
commit 7f2eb8fff2
3 changed files with 22 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
ext/fts3/fts3_snippet.c
View File

@ -17,6 +17,10 @@
#include <string.h>
#include <assert.h>
#ifndef SQLITE_AMALGAMATION
typedef sqlite3_int64 i64;
#endif
/*
** Characters that may appear in the second argument to matchinfo().
*/
@ -67,9 +71,9 @@ struct SnippetIter {
struct SnippetPhrase {
int nToken; /* Number of tokens in phrase */
char *pList; /* Pointer to start of phrase position list */
int iHead; /* Next value in position list */
i64 iHead; /* Next value in position list */
char *pHead; /* Position list data following iHead */
int iTail; /* Next value in trailing position list */
i64 iTail; /* Next value in trailing position list */
char *pTail; /* Position list data following iTail */
};
@ -234,7 +238,7 @@ void sqlite3Fts3MIBufferFree(MatchinfoBuffer *p){
** After it returns, *piPos contains the value of the next element of the
** list and *pp is advanced to the following varint.
*/
static void fts3GetDeltaPosition(char **pp, int *piPos){
static void fts3GetDeltaPosition(char **pp, i64 *piPos){
int iVal;
*pp += fts3GetVarint32(*pp, &iVal);
*piPos += (iVal-2);
@ -343,10 +347,10 @@ static int fts3ExprPhraseCount(Fts3Expr *pExpr){
** arguments so that it points to the first element with a value greater
** than or equal to parameter iNext.
*/
static void fts3SnippetAdvance(char **ppIter, int *piIter, int iNext){
static void fts3SnippetAdvance(char **ppIter, i64 *piIter, int iNext){
char *pIter = *ppIter;
if( pIter ){
int iIter = *piIter;
i64 iIter = *piIter;
while( iIter<iNext ){
if( 0==(*pIter & 0xFE) ){
@ -429,7 +433,7 @@ static void fts3SnippetDetails(
SnippetPhrase *pPhrase = &pIter->aPhrase[i];
if( pPhrase->pTail ){
char *pCsr = pPhrase->pTail;
int iCsr = pPhrase->iTail;
i64 iCsr = pPhrase->iTail;
while( iCsr<(iStart+pIter->nSnippet) && iCsr>=iStart ){
int j;
@ -475,7 +479,7 @@ static int fts3SnippetFindPositions(Fts3Expr *pExpr, int iPhrase, void *ctx){
rc = sqlite3Fts3EvalPhrasePoslist(p->pCsr, pExpr, p->iCol, &pCsr);
assert( rc==SQLITE_OK || pCsr==0 );
if( pCsr ){
int iFirst = 0;
i64 iFirst = 0;
pPhrase->pList = pCsr;
fts3GetDeltaPosition(&pCsr, &iFirst);
if( iFirst<0 ){
@ -1539,8 +1543,8 @@ typedef struct TermOffsetCtx TermOffsetCtx;
struct TermOffset {
char *pList; /* Position-list */
int iPos; /* Position just read from pList */
int iOff; /* Offset of this term from read positions */
i64 iPos; /* Position just read from pList */
i64 iOff; /* Offset of this term from read positions */
};
struct TermOffsetCtx {
@ -1559,7 +1563,7 @@ static int fts3ExprTermOffsetInit(Fts3Expr *pExpr, int iPhrase, void *ctx){
int nTerm; /* Number of tokens in phrase */
int iTerm; /* For looping through nTerm phrase terms */
char *pList; /* Pointer to position list for phrase */
int iPos = 0; /* First position in position-list */
i64 iPos = 0; /* First position in position-list */
int rc;
UNUSED_PARAMETER(iPhrase);