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Prevent memory leaks in parseRelOptions(). 

parseRelOptions() tended to leak memory in the caller's context.  Most
of the time this doesn't really matter since the caller's context is
at most query-lifespan, and the function won't be invoked very many times.
However, when testing with CLOBBER_CACHE_RECURSIVELY, the same relcache
entry can get rebuilt a *lot* of times in one query, leading to significant
intraquery memory bloat if it has any reloptions.  Noted while
investigating a related report from Tomas Vondra.

In passing, get rid of some Asserts that are redundant with the one
done by deconstruct_array().

As with other patches to avoid leaks in CLOBBER_CACHE testing, it doesn't
really seem worth back-patching this.
This commit is contained in:
Tom Lane 2014-08-13 11:35:51 -04:00
parent ab8c84db2f
commit a844c29966
1 changed files with 6 additions and 9 deletions
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15
src/backend/access/common/reloptions.c
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@ -620,8 +620,6 @@ transformRelOptions(Datum oldOptions, List *defList, char *namspace,
int noldoptions;
int i;
Assert(ARR_ELEMTYPE(array) == TEXTOID);
deconstruct_array(array, TEXTOID, -1, false, 'i',
&oldoptions, NULL, &noldoptions);
@ -777,8 +775,6 @@ untransformRelOptions(Datum options)
array = DatumGetArrayTypeP(options);
Assert(ARR_ELEMTYPE(array) == TEXTOID);
deconstruct_array(array, TEXTOID, -1, false, 'i',
&optiondatums, NULL, &noptions);
@ -912,14 +908,10 @@ parseRelOptions(Datum options, bool validate, relopt_kind kind,
/* Done if no options */
if (PointerIsValid(DatumGetPointer(options)))
{
ArrayType *array;
ArrayType *array = DatumGetArrayTypeP(options);
Datum *optiondatums;
int noptions;
array = DatumGetArrayTypeP(options);
Assert(ARR_ELEMTYPE(array) == TEXTOID);
deconstruct_array(array, TEXTOID, -1, false, 'i',
&optiondatums, NULL, &noptions);
@ -959,6 +951,11 @@ parseRelOptions(Datum options, bool validate, relopt_kind kind,
errmsg("unrecognized parameter \"%s\"", s)));
}
}
/* It's worth avoiding memory leaks in this function */
pfree(optiondatums);
if (((void *) array) != DatumGetPointer(options))
pfree(array);
}
*numrelopts = numoptions;