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Commit80c925c

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Avoid multiple free_struct_lconv() calls on same data.
A failure partway through PGLC_localeconv() led to a situation wherethe next call would call free_struct_lconv() a second time, leadingto free() on already-freed strings, typically leading to a core dump.Add a flag to remember whether we need to do that.Per report from Thom Brown. His example case only provokes the failureas far back as 9.4, but nonetheless this code is obviously broken, soback-patch to all supported branches.
1 parentf6a6057 commit80c925c

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+11
-5
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1 file changed

+11
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‎src/backend/utils/adt/pg_locale.c

Lines changed: 11 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -387,9 +387,6 @@ assign_locale_messages(const char *newval, void *extra)
387387
staticvoid
388388
free_struct_lconv(structlconv*s)
389389
{
390-
if (s==NULL)
391-
return;
392-
393390
if (s->currency_symbol)
394391
free(s->currency_symbol);
395392
if (s->decimal_point)
@@ -441,6 +438,7 @@ struct lconv *
441438
PGLC_localeconv(void)
442439
{
443440
staticstructlconvCurrentLocaleConv;
441+
staticboolCurrentLocaleConvAllocated= false;
444442
structlconv*extlconv;
445443
char*save_lc_monetary;
446444
char*save_lc_numeric;
@@ -457,7 +455,12 @@ PGLC_localeconv(void)
457455
if (CurrentLocaleConvValid)
458456
return&CurrentLocaleConv;
459457

460-
free_struct_lconv(&CurrentLocaleConv);
458+
/* Free any already-allocated storage */
459+
if (CurrentLocaleConvAllocated)
460+
{
461+
free_struct_lconv(&CurrentLocaleConv);
462+
CurrentLocaleConvAllocated= false;
463+
}
461464

462465
/* Save user's values of monetary and numeric locales */
463466
save_lc_monetary=setlocale(LC_MONETARY,NULL);
@@ -521,7 +524,9 @@ PGLC_localeconv(void)
521524

522525
/*
523526
* Must copy all values since restoring internal settings may overwrite
524-
* localeconv()'s results.
527+
* localeconv()'s results. Note that if we were to fail within this
528+
* sequence before reaching "CurrentLocaleConvAllocated = true", we could
529+
* leak some memory --- but not much, so it's not worth agonizing over.
525530
*/
526531
CurrentLocaleConv=*extlconv;
527532
CurrentLocaleConv.decimal_point=decimal_point;
@@ -534,6 +539,7 @@ PGLC_localeconv(void)
534539
CurrentLocaleConv.mon_thousands_sep=db_encoding_strdup(encoding,extlconv->mon_thousands_sep);
535540
CurrentLocaleConv.negative_sign=db_encoding_strdup(encoding,extlconv->negative_sign);
536541
CurrentLocaleConv.positive_sign=db_encoding_strdup(encoding,extlconv->positive_sign);
542+
CurrentLocaleConvAllocated= true;
537543

538544
/* Try to restore internal settings */
539545
if (save_lc_monetary)

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