f528260b1a
release_pte_pages() converts from a pfn to a folio by using pfn_folio(). If the pte is not mapped, pfn_folio() will result in undefined behavior which ends up causing a kernel panic[1]. Only call pfn_folio() once we have validated that the pte is both valid and mapped to fix the issue. [1] https://lore.kernel.org/linux-mm/ff300770-afe9-908d-23ed-d23e0796e899@samsung.com/ Link: https://lkml.kernel.org/r/20230213214324.34215-1-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com> Fixes: 9bdfeea46f49 ("mm/khugepaged: convert release_pte_pages() to use folios") Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Debugged-by: Alexandre Ghiti <alex@ghiti.fr> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.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.