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pageinspect: Fix crash with gist_page_items()

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Attempting to use this function with a raw page not coming from a GiST
index would cause a crash, as it was missing the same sanity checks as
gist_page_items_bytea().  This slightly refactors the code so as all the
basic validation checks for GiST pages are done in a single routine,
in the same fashion as the pageinspect functions for hash and BRIN.

This fixes an issue similar to 076f4d9.  A test is added to stress for
this case.  While on it, I have added a similar test for
brin_page_items() with a combination make of a valid GiST index and a
raw btree page.  This one was already protected, but it was not tested.

Reported-by: Egor Chindyaskin
Author: Dmitry Koval
Discussion: https://postgr.es/m/17815-fc4a2d3b74705703@postgresql.org
Backpatch-through: 14
This commit is contained in:
Michael Paquier
2023-03-02 14:03:21 +09:00
parent 1a9356f657
commit 5ad63eee13
5 changed files with 65 additions and 59 deletions
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12
contrib/pageinspect/expected/gist.out
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@ -66,14 +66,16 @@ SELECT itemoffset, ctid, itemlen FROM gist_page_items_bytea(get_raw_page('test_g
7 | (7,65535) | 40
(7 rows)
-- Failure with non-GiST index.
CREATE INDEX test_gist_btree on test_gist(t);
SELECT gist_page_items(get_raw_page('test_gist_btree', 0), 'test_gist_btree');
ERROR: "test_gist_btree" is not a GiST index
-- Failure with various modes.
-- Suppress the DETAIL message, to allow the tests to work across various
-- page sizes and architectures.
\set VERBOSITY terse
-- Failures with non-GiST index.
CREATE INDEX test_gist_btree on test_gist(t);
SELECT gist_page_items(get_raw_page('test_gist_btree', 0), 'test_gist_btree');
ERROR: "test_gist_btree" is not a GiST index
SELECT gist_page_items(get_raw_page('test_gist_btree', 0), 'test_gist_idx');
ERROR: input page is not a valid GiST page
-- Failure with various modes.
-- invalid page size
SELECT gist_page_items_bytea('aaa'::bytea);
ERROR: invalid page size