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Richard Fitzgerald 7ba822189e
 regmap: kunit: Fix array overflow in stride() test 
Force the max_register of the test regmap to be one register longer
than the number of test registers, to prevent an array overflow in
the test loop.

The test defines num_reg_defaults = 6. With 6 registers and
stride == 2 the valid register addresses would be 0, 2, 4, 6, 8, 10.
However the loop checks attempting to access the odd address, so on
the final register it accesses address 11, and it writes entry [11]
of the read/written arrays.

Originally this worked because the max_register of the regmap was
hardcoded to be BLOCK_TEST_SIZE (== 12).

commit 710915743d ("regmap: kunit: Run sparse cache tests at non-zero
register addresses")
introduced the ability to start the test address range from any address,
which means adjusting the max_register. If max_register was not forced,
it was calculated either from num_reg_defaults or BLOCK_TEST_SIZE. This
correctly calculated that with num_reg_defaults == 6 and stride == 2 the
final valid address is 10. So the read/written arrays are allocated to
contain entries [0..10]. When stride attempted to access [11] it was
overflowing the array.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 710915743d ("regmap: kunit: Run sparse cache tests at non-zero register addresses")
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://msgid.link/r/20240517144703.1200995-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
History 2024-05-17 18:23:12 +01:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.