mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Prevent memory leaks in parseRelOptions().

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/backend/access/common/reloptions.c
View File

@ -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;