f1d96a8fcb
Processing links, io_submit_sqe() prepares requests, drops sqes, and passes them with sqe=NULL to io_queue_sqe(). There IOSQE_DRAIN and/or IOSQE_ASYNC requests will go through the same prep, which doesn't expect sqe=NULL and fail with NULL pointer deference. Always do full prepare including io_alloc_async_ctx() for linked requests, and then it can skip the second preparation. Cc: stable@vger.kernel.org # 5.5 Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.