| From: | Ranier Vilela <ranier_gyn(at)hotmail(dot)com> |
|---|---|
| To: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | [PATCH][BUG FIX] Pointer arithmetic with NULL |
| Date: | 2019-11-22 17:19:11 |
| Message-ID: | MN2PR18MB29278065C7E7B4F20333BDFEE3490@MN2PR18MB2927.namprd18.prod.outlook.com |
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| Thread: | |
| Lists: | pgsql-hackers |
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;
}
/*
| Attachment | Content-Type | Size |
|---|---|---|
| xlog.c.patch | application/octet-stream | 391 bytes |
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