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[1.5.x] Fixed queries that may return unexpected results on MySQL due to typecasting.

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This is a security fix. Disclosure will follow shortly.

Backport of 75c0d4ea3a from master
This commit is contained in:
Erik Romijn 2014-04-20 16:29:40 -04:00 • committed by Tim Graham
parent 6872f42757
commit 985434fb1d
6 changed files with 155 additions and 2 deletions
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10
docs/howto/custom-model-fields.txt
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@ -501,6 +501,16 @@ For example::
return ''.join([''.join(l) for l in (value.north,
value.east, value.south, value.west)])
.. warning::
If your custom field uses the ``CHAR``, ``VARCHAR`` or ``TEXT``
types for MySQL, you must make sure that :meth:`.get_prep_value`
always returns a string type. MySQL performs flexible and unexpected
matching when a query is performed on these types and the provided
value is an integer, which can cause queries to include unexpected
objects in their results. This problem cannot occur if you always
return a string type from :meth:`.get_prep_value`.
Converting query values to database values
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~