Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commite262755

Browse files
committed
Fix cache flush hazard in cache_record_field_properties().
We need to increment the refcount on the composite type's cached tupledescriptor while we do lookups of its column types. Otherwise a cacheflush could occur and release the tuple descriptor before we're done withit. This fails reliably with -DCLOBBER_CACHE_ALWAYS, but the odds of afailure in a production build seem rather low (since the pfree'd descriptortypically wouldn't get scribbled on immediately). That may explain thelack of any previous reports. Buildfarm issue noted by Christian Ullrich.Back-patch to 9.1 where the bogus code was added.
1 parentecdec47 commite262755

File tree

1 file changed

+5
-0
lines changed

1 file changed

+5
-0
lines changed

‎src/backend/utils/cache/typcache.c‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -648,6 +648,9 @@ cache_record_field_properties(TypeCacheEntry *typentry)
648648
load_typcache_tupdesc(typentry);
649649
tupdesc=typentry->tupDesc;
650650

651+
/* Must bump the refcount while we do additional catalog lookups */
652+
IncrTupleDescRefCount(tupdesc);
653+
651654
/* Have each property if all non-dropped fields have the property */
652655
newflags= (TCFLAGS_HAVE_FIELD_EQUALITY |
653656
TCFLAGS_HAVE_FIELD_COMPARE);
@@ -671,6 +674,8 @@ cache_record_field_properties(TypeCacheEntry *typentry)
671674
break;
672675
}
673676
typentry->flags |=newflags;
677+
678+
DecrTupleDescRefCount(tupdesc);
674679
}
675680
typentry->flags |=TCFLAGS_CHECKED_FIELD_PROPERTIES;
676681
}

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp