[PATCH][BUG FIX] Pointer arithmetic with NULL
От
Ranier Vilela
Тема
[PATCH][BUG FIX] Pointer arithmetic with NULL
Дата
Msg-id
MN2PR18MB29278065C7E7B4F20333BDFEE3490@MN2PR18MB2927.namprd18.prod.outlook.com
Список
Дерево обсуждения
[PATCH][BUG FIX] Pointer arithmetic with NULL Ranier Vilela <ranier_gyn@hotmail.com>
Re: [PATCH][BUG FIX] Pointer arithmetic with NULL Tomas Vondra <tomas.vondra@2ndquadrant.com>
Hi,
Pointer addition with NULL, is technically undefined behavior.
Best regards.
Ranier Vilela
--- \dll\postgresql-12.0\a\backend\access\transam\xlog.c Mon Sep 30 17:06:55 2019
+++ xlog.c Fri Nov 22 13:57:17 2019
@@ -1861,7 +1861,7 @@
{
Assert(((XLogPageHeader) cachedPos)->xlp_magic == XLOG_PAGE_MAGIC);
Assert(((XLogPageHeader) cachedPos)->xlp_pageaddr == ptr - (ptr % XLOG_BLCKSZ));
- return cachedPos + ptr % XLOG_BLCKSZ;
+ return ptr % XLOG_BLCKSZ;
}
/*
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