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__counted_by() has to point to a variable which defines the size of the related array. The code must never access the array beyond this limit. struct prbtest_rbdata currently stores the length of the string. And the code access the array beyond the limit when writing or reading the trailing '\0'. Store the size of the string, including the trailing '\0' if we wanted to keep __counted_by(). Consistently use "_size" suffix when the trailing '\0' is counted. Note that MAX_RBDATA_TEXT_SIZE was originally used to limit the text length. When touching the code, make sure that @text_size produced by get_random_u32_inclusive() stays within the limits. Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/r/eaea66b9-266a-46e7-980d-33f40ad4b215@sabinyo.mountain Suggested-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Reviewed-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Link: https://patch.msgid.link/20250702095157.110916-4-pmladek@suse.com Signed-off-by: Petr Mladek <pmladek@suse.com>
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.