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A type of inconsistency that can show up in control URBs is when the setup packet's wLength value does not match the URB's transfer_buffer_length field. The two should always be equal; differences could lead to information leaks or undefined behavior for OUT transfers or overruns for IN transfers. This patch adds a test for such mismatches during URB submission. If the test fails, the submission is rejected with a -EBADR error code (which is not used elsewhere in the USB core), and a debugging message is logged for people interested in tracking down these errors. Reviewed-by: Johan Hovold <johan@kernel.org> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Link: https://lore.kernel.org/r/20210526153244.GA1400430@rowland.harvard.edu Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 Restructured Text 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.