f722002441
This reverts commit 57ead1bf1c54, which updated the CCM code to only rely on walk.nbytes to check for failures returned from the skcipher walk API, mostly for the common good rather than to fix a particular problem in the code. This change introduces a problem of its own: the skcipher walk is started with the 'atomic' argument set to false, which means that the skcipher walk API is permitted to sleep. Subsequently, it invokes skcipher_walk_done() with preemption disabled on the final iteration of the loop. This appears to work by accident, but it is arguably a bad example, and providing a better example was the point of the original patch. Given that future changes to the CCM code will rely on the original behavior of entering the loop even for zero sized inputs, let's just revert this change entirely, and proceed from there. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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.