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Commit1116c9d

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committed
Prevent corner-case core dump in rfree().
rfree() failed to cope with the case that pg_regcomp() had initialized theregex_t struct but then failed to allocate any memory for re->re_guts (ie,the first malloc call in pg_regcomp() failed). It would try to touch theguts struct anyway, and thus dump core. This is a sufficiently narrowcorner case that it's not surprising it's never been seen in the field;but still a bug is a bug, so patch all active branches.Noted while investigating whether we need to call pg_regfree after afailure return from pg_regcomp. Other than this bug, it turns out wedon't, so adjust comments appropriately.
1 parenteb972f3 commit1116c9d

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2 files changed

+16
-11
lines changed

2 files changed

+16
-11
lines changed

‎src/backend/regex/regcomp.c‎

Lines changed: 15 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -278,6 +278,9 @@ static struct fns functions = {
278278

279279
/*
280280
* pg_regcomp - compile regular expression
281+
*
282+
* Note: on failure, no resources remain allocated, so pg_regfree()
283+
* need not be applied to re.
281284
*/
282285
int
283286
pg_regcomp(regex_t*re,
@@ -1870,15 +1873,18 @@ rfree(regex_t *re)
18701873
g= (structguts*)re->re_guts;
18711874
re->re_guts=NULL;
18721875
re->re_fns=NULL;
1873-
g->magic=0;
1874-
freecm(&g->cmap);
1875-
if (g->tree!=NULL)
1876-
freesubre((structvars*)NULL,g->tree);
1877-
if (g->lacons!=NULL)
1878-
freelacons(g->lacons,g->nlacons);
1879-
if (!NULLCNFA(g->search))
1880-
freecnfa(&g->search);
1881-
FREE(g);
1876+
if (g!=NULL)
1877+
{
1878+
g->magic=0;
1879+
freecm(&g->cmap);
1880+
if (g->tree!=NULL)
1881+
freesubre((structvars*)NULL,g->tree);
1882+
if (g->lacons!=NULL)
1883+
freelacons(g->lacons,g->nlacons);
1884+
if (!NULLCNFA(g->search))
1885+
freecnfa(&g->search);
1886+
FREE(g);
1887+
}
18821888
}
18831889

18841890
#ifdefREG_DEBUG

‎src/backend/utils/adt/regexp.c‎

Lines changed: 1 addition & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -187,9 +187,8 @@ RE_compile_and_cache(text *text_re, int cflags, Oid collation)
187187

188188
if (regcomp_result!=REG_OKAY)
189189
{
190-
/* re didn't compile */
190+
/* re didn't compile(no need for pg_regfree, if so)*/
191191
pg_regerror(regcomp_result,&re_temp.cre_re,errMsg,sizeof(errMsg));
192-
/* XXX should we pg_regfree here? */
193192
ereport(ERROR,
194193
(errcode(ERRCODE_INVALID_REGULAR_EXPRESSION),
195194
errmsg("invalid regular expression: %s",errMsg)));

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