| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | pgsql-committers(at)postgresql(dot)org |
| Subject: | pgsql: Protect GIST logic that assumes penalty values can't be negative |
| Date: | 2011-05-31 21:54:37 |
| Message-ID: | E1QRWtZ-0000Qm-VD@gemulon.postgresql.org |
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| Lists: | pgsql-committers |
Protect GIST logic that assumes penalty values can't be negative.
Apparently sane-looking penalty code might return small negative values,
for example because of roundoff error. This will confuse places like
gistchoose(). Prevent problems by clamping negative penalty values to
zero. (Just to be really sure, I also made it force NaNs to zero.)
Back-patch to all supported branches.
Alexander Korotkov
Branch
------
REL9_0_STABLE
Details
-------
http://git.postgresql.org/pg/commitdiff/b26d8fda6535799be6eee1e93a8f11756b11af95
Modified Files
--------------
doc/src/sgml/gist.sgml | 2 ++
src/backend/access/gist/gistutil.c | 14 +++++++++++---
2 files changed, 13 insertions(+), 3 deletions(-)
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