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commit29ad6bb313upstream. In the case of reverse allocation, mas->index and mas->last do not point to the correct allocation range, which will cause users to get incorrect allocation results, so fix it. If the user does not use it in a specific way, this bug will not be triggered. This is a bug, but only VMA uses it now, the way VMA is used now will not trigger it. There is a possibility that a user will trigger it in the future. Also re-check whether the size is still satisfied after the lower bound was increased, which is a corner case and is incorrect in previous versions. Link: https://lkml.kernel.org/r/20230419093625.99201-1-zhangpeng.00@bytedance.com Fixes:54a611b605("Maple Tree: add new data structure") Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com> Cc: Liam R. Howlett <Liam.Howlett@Oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> 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.