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In driver/md/md.c, if the function autorun_array() is called, the problem of double free may occur. In function autorun_array(), when the function do_md_run() returns an error, the function do_md_stop() will be called. The function do_md_run() called function md_run(), but in function md_run(), the pointer mddev->private may be freed. The function do_md_stop() called the function __md_stop(), but in function __md_stop(), the pointer mddev->private also will be freed without judging null. At this time, the pointer mddev->private will be double free, so it needs to be judged null or not. Signed-off-by: zhangyue <zhangyue1@kylinos.cn> Signed-off-by: Song Liu <songliubraving@fb.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 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.