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Add assertion to check the special size is sane before dereferencing it.

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This seems useful to catch errors of the sort I just fixed, where
PageGetSpecialPointer is called before initializing the page.
This commit is contained in:
Heikki Linnakangas 2015-06-30 13:44:04 +03:00
parent fdf28853ae
commit 302ac7f271
1 changed files with 2 additions and 0 deletions
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2
src/include/storage/bufpage.h
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@ -304,6 +304,8 @@ typedef PageHeaderData *PageHeader;
#define PageGetSpecialPointer(page) \
( \
AssertMacro(PageIsValid(page)), \
AssertMacro(((PageHeader) (page))->pd_special <= BLCKSZ), \
AssertMacro(((PageHeader) (page))->pd_special >= SizeOfPageHeaderData), \
(char *) ((char *) (page) + ((PageHeader) (page))->pd_special) \
)