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| author | Thomas Munro <tmunro@postgresql.org> | 2023-09-26 09:07:26 +1300 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2023-09-26 10:53:38 +1300 |
| commit | becfbdd6c1c94fe03391368080029a6dd8523658 (patch) | |
| tree | ad34f7ca7e042a4b428fbb32509535339634ab89 /src/tutorial/funcs.c | |
| parent | 13aeaf0797e75a0c53abb66ac907ba14b4e47f6b (diff) | |
| download | postgresql-becfbdd6c1c94fe03391368080029a6dd8523658.tar.gz postgresql-becfbdd6c1c94fe03391368080029a6dd8523658.zip | |
Fix edge-case for xl_tot_len broken by bae868ca.
bae868ca removed a check that was still needed. If you had an
xl_tot_len at the end of a page that was too small for a record header,
but not big enough to span onto the next page, we'd immediately perform
the CRC check using a bogus large length. Because of arbitrary coding
differences between the CRC implementations on different platforms,
nothing very bad happened on common modern systems. On systems using
the _sb8.c fallback we could segfault.
Restore that check, add a new assertion and supply a test for that case.
Back-patch to 12, like bae868ca.
Tested-by: Tom Lane <tgl@sss.pgh.pa.us>
Tested-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://postgr.es/m/CA%2BhUKGLCkTT7zYjzOxuLGahBdQ%3DMcF%3Dz5ZvrjSOnW4EDhVjT-g%40mail.gmail.com
Diffstat (limited to 'src/tutorial/funcs.c')
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