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Commitcd42dd5

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Fix core dump with buffer-overrun by too long infinitive. Add checking of using
fixed length arrays to prevent array's overrun. Per report byHannes Dorbath <light@theendofthetunnel.de> and comments by Tom.
1 parent0153c4c commitcd42dd5

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1 file changed

+47
-32
lines changed

1 file changed

+47
-32
lines changed

‎src/backend/tsearch/spell.c

Lines changed: 47 additions & 32 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
99
* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/backend/tsearch/spell.c,v 1.9 2008/01/01 19:45:52 momjian Exp $
10+
* $PostgreSQL: pgsql/src/backend/tsearch/spell.c,v 1.10 2008/01/16 13:01:03 teodor Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -1327,8 +1327,7 @@ addToResult(char **forms, char **cur, char *word)
13271327
if (forms==cur||strcmp(word,*(cur-1))!=0)
13281328
{
13291329
*cur=pstrdup(word);
1330-
cur++;
1331-
*cur=NULL;
1330+
*(cur+1)=NULL;
13321331
return1;
13331332
}
13341333

@@ -1448,6 +1447,7 @@ NormalizeSubWord(IspellDict *Conf, char *word, int flag)
14481447
typedefstructSplitVar
14491448
{
14501449
intnstem;
1450+
intlenstem;
14511451
char**stem;
14521452
structSplitVar*next;
14531453
}SplitVar;
@@ -1495,21 +1495,38 @@ CopyVar(SplitVar *s, int makedup)
14951495
{
14961496
SplitVar*v= (SplitVar*)palloc(sizeof(SplitVar));
14971497

1498-
v->stem= (char**)palloc(sizeof(char*)* (MAX_NORM));
14991498
v->next=NULL;
15001499
if (s)
15011500
{
15021501
inti;
15031502

1503+
v->lenstem=s->lenstem;
1504+
v->stem= (char**)palloc(sizeof(char*)*v->lenstem);
15041505
v->nstem=s->nstem;
15051506
for (i=0;i<s->nstem;i++)
15061507
v->stem[i]= (makedup) ?pstrdup(s->stem[i]) :s->stem[i];
15071508
}
15081509
else
1510+
{
1511+
v->lenstem=16;
1512+
v->stem= (char**)palloc(sizeof(char*)*v->lenstem);
15091513
v->nstem=0;
1514+
}
15101515
returnv;
15111516
}
15121517

1518+
staticvoid
1519+
AddStem(SplitVar*v,char*word)
1520+
{
1521+
if (v->nstem >=v->lenstem )
1522+
{
1523+
v->lenstem *=2;
1524+
v->stem= (char**)repalloc(v->stem,sizeof(char*)*v->lenstem);
1525+
}
1526+
1527+
v->stem[v->nstem]=word;
1528+
v->nstem++;
1529+
}
15131530

15141531
staticSplitVar*
15151532
SplitToVariants(IspellDict*Conf,SPNode*snode,SplitVar*orig,char*word,intwordlen,intstartpos,intminpos)
@@ -1550,11 +1567,13 @@ SplitToVariants(IspellDict *Conf, SPNode *snode, SplitVar *orig, char *word, int
15501567
if (level+lenaff-1 <=minpos)
15511568
continue;
15521569

1570+
if (lenaff >=MAXNORMLEN )
1571+
continue;/* skip too big value */
15531572
if (lenaff>0)
15541573
memcpy(buf,word+startpos,lenaff);
15551574
buf[lenaff]='\0';
15561575

1557-
if (level==FF_COMPOUNDBEGIN)
1576+
if (level==0)
15581577
compoundflag=FF_COMPOUNDBEGIN;
15591578
elseif (level==wordlen-1)
15601579
compoundflag=FF_COMPOUNDLAST;
@@ -1572,8 +1591,7 @@ SplitToVariants(IspellDict *Conf, SPNode *snode, SplitVar *orig, char *word, int
15721591

15731592
while (*sptr)
15741593
{
1575-
new->stem[new->nstem]=*sptr;
1576-
new->nstem++;
1594+
AddStem(new,*sptr );
15771595
sptr++;
15781596
}
15791597
pfree(subres);
@@ -1624,8 +1642,7 @@ SplitToVariants(IspellDict *Conf, SPNode *snode, SplitVar *orig, char *word, int
16241642
if (wordlen==level+1)
16251643
{
16261644
/* well, it was last word */
1627-
var->stem[var->nstem]=pnstrdup(word+startpos,wordlen-startpos);
1628-
var->nstem++;
1645+
AddStem(var,pnstrdup(word+startpos,wordlen-startpos) );
16291646
pfree(notprobed);
16301647
returnvar;
16311648
}
@@ -1639,8 +1656,7 @@ SplitToVariants(IspellDict *Conf, SPNode *snode, SplitVar *orig, char *word, int
16391656
ptr->next=SplitToVariants(Conf,node,var,word,wordlen,startpos,level);
16401657
/* we can find next word */
16411658
level++;
1642-
var->stem[var->nstem]=pnstrdup(word+startpos,level-startpos);
1643-
var->nstem++;
1659+
AddStem(var,pnstrdup(word+startpos,level-startpos) );
16441660
node=Conf->Dictionary;
16451661
startpos=level;
16461662
continue;
@@ -1654,12 +1670,26 @@ SplitToVariants(IspellDict *Conf, SPNode *snode, SplitVar *orig, char *word, int
16541670
level++;
16551671
}
16561672

1657-
var->stem[var->nstem]=pnstrdup(word+startpos,wordlen-startpos);
1658-
var->nstem++;
1673+
AddStem(var,pnstrdup(word+startpos,wordlen-startpos) );
16591674
pfree(notprobed);
16601675
returnvar;
16611676
}
16621677

1678+
staticvoid
1679+
addNorm(TSLexeme**lres,TSLexeme**lcur,char*word,intflags,uint16NVariant)
1680+
{
1681+
if (*lres==NULL )
1682+
*lcur=*lres= (TSLexeme*)palloc(MAX_NORM*sizeof(TSLexeme));
1683+
1684+
if (*lcur-*lres<MAX_NORM-1 ) {
1685+
(*lcur)->lexeme=word;
1686+
(*lcur)->flags=flags;
1687+
(*lcur)->nvariant=NVariant;
1688+
(*lcur)++;
1689+
(*lcur)->lexeme=NULL;
1690+
}
1691+
}
1692+
16631693
TSLexeme*
16641694
NINormalizeWord(IspellDict*Conf,char*word)
16651695
{
@@ -1674,16 +1704,11 @@ NINormalizeWord(IspellDict *Conf, char *word)
16741704
{
16751705
char**ptr=res;
16761706

1677-
lcur=lres= (TSLexeme*)palloc(MAX_NORM*sizeof(TSLexeme));
1678-
while (*ptr)
1707+
while (*ptr&& (lcur-lres)<MAX_NORM)
16791708
{
1680-
lcur->lexeme=*ptr;
1681-
lcur->flags=0;
1682-
lcur->nvariant=NVariant++;
1683-
lcur++;
1709+
addNorm(&lres,&lcur,*ptr,0,NVariant++);
16841710
ptr++;
16851711
}
1686-
lcur->lexeme=NULL;
16871712
pfree(res);
16881713
}
16891714

@@ -1704,28 +1729,18 @@ NINormalizeWord(IspellDict *Conf, char *word)
17041729
{
17051730
char**subptr=subres;
17061731

1707-
if (!lcur)
1708-
lcur=lres= (TSLexeme*)palloc(MAX_NORM*sizeof(TSLexeme));
1709-
17101732
while (*subptr)
17111733
{
17121734
for (i=0;i<var->nstem-1;i++)
17131735
{
1714-
lcur->lexeme= (subptr==subres) ?var->stem[i] :pstrdup(var->stem[i]);
1715-
lcur->flags=0;
1716-
lcur->nvariant=NVariant;
1717-
lcur++;
1736+
addNorm(&lres,&lcur, (subptr==subres) ?var->stem[i] :pstrdup(var->stem[i]),0,NVariant);
17181737
}
17191738

1720-
lcur->lexeme=*subptr;
1721-
lcur->flags=0;
1722-
lcur->nvariant=NVariant;
1723-
lcur++;
1739+
addNorm(&lres,&lcur,*subptr,0,NVariant);
17241740
subptr++;
17251741
NVariant++;
17261742
}
17271743

1728-
lcur->lexeme=NULL;
17291744
pfree(subres);
17301745
var->stem[0]=NULL;
17311746
pfree(var->stem[var->nstem-1]);

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