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Commit599a487

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Defend against stack overrun in a few more places.
SplitToVariants() in the ispell code, lseg_inside_poly() in geo_ops.c,and regex_selectivity_sub() in selectivity estimation could recurseuntil stack overflow; fix by adding check_stack_depth() calls.So could next() in the regex compiler, but that case is better fixed byconverting its tail recursion to a loop. (We probably get better codethat way too, since next() can now be inlined into its sole caller.)There remains a reachable stack overrun in the Turkish stemmer, butwe'll need some advice from the Snowball people about how to fix that.Per report from Egor Chindyaskin and Alexander Lakhin. These mistakesare old, so back-patch to all supported branches.Richard Guo and Tom LaneDiscussion:https://postgr.es/m/1661334672.728714027@f473.i.mail.ru
1 parent7951e0d commit599a487

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4 files changed

+14
-2
lines changed

4 files changed

+14
-2
lines changed

‎src/backend/regex/regc_lex.c

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -278,6 +278,8 @@ next(struct vars *v)
278278
{
279279
chrc;
280280

281+
next_restart:/* loop here after eating a comment */
282+
281283
/* errors yield an infinite sequence of failures */
282284
if (ISERR())
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return0;/* the error has set nexttype to EOS */
@@ -595,8 +597,7 @@ next(struct vars *v)
595597
if (!ATEOS())
596598
v->now++;
597599
assert(v->nexttype==v->lasttype);
598-
returnnext(v);
599-
break;
600+
gotonext_restart;
600601
caseCHR('='):/* positive lookahead */
601602
NOTE(REG_ULOOKAROUND);
602603
RETV(LACON,LATYPE_AHEAD_POS);

‎src/backend/tsearch/spell.c

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -63,6 +63,7 @@
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#include"postgres.h"
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6565
#include"catalog/pg_collation.h"
66+
#include"miscadmin.h"
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#include"tsearch/dicts/spell.h"
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#include"tsearch/ts_locale.h"
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#include"utils/memutils.h"
@@ -2399,6 +2400,9 @@ SplitToVariants(IspellDict *Conf, SPNode *snode, SplitVar *orig, char *word, int
23992400
char*notprobed;
24002401
intcompoundflag=0;
24012402

2403+
/* since this function recurses, it could be driven to stack overflow */
2404+
check_stack_depth();
2405+
24022406
notprobed= (char*)palloc(wordlen);
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memset(notprobed,1,wordlen);
24042408
var=CopyVar(orig,1);

‎src/backend/utils/adt/geo_ops.c

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3791,6 +3791,9 @@ lseg_inside_poly(Point *a, Point *b, POLYGON *poly, int start)
37913791
boolres= true,
37923792
intersection= false;
37933793

3794+
/* since this function recurses, it could be driven to stack overflow */
3795+
check_stack_depth();
3796+
37943797
t.p[0]=*a;
37953798
t.p[1]=*b;
37963799
s.p[0]=poly->p[(start==0) ? (poly->npts-1) : (start-1)];

‎src/backend/utils/adt/like_support.c

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -43,6 +43,7 @@
4343
#include"catalog/pg_statistic.h"
4444
#include"catalog/pg_type.h"
4545
#include"mb/pg_wchar.h"
46+
#include"miscadmin.h"
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#include"nodes/makefuncs.h"
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#include"nodes/nodeFuncs.h"
4849
#include"nodes/supportnodes.h"
@@ -1320,6 +1321,9 @@ regex_selectivity_sub(const char *patt, int pattlen, bool case_insensitive)
13201321
intparen_pos=0;/* dummy init to keep compiler quiet */
13211322
intpos;
13221323

1324+
/* since this function recurses, it could be driven to stack overflow */
1325+
check_stack_depth();
1326+
13231327
for (pos=0;pos<pattlen;pos++)
13241328
{
13251329
if (patt[pos]=='(')

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