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Andreas Gruenbacher 1d47922b98 gfs2: Fix slab-use-after-free in qd_put 
[ Upstream commit 22150a7d40 ]

Commit a475c5dd16 ("gfs2: Free quota data objects synchronously")
started freeing quota data objects during filesystem shutdown instead of
putting them back onto the LRU list, but it failed to remove these
objects from the LRU list, causing LRU list corruption.  This caused
use-after-free when the shrinker (gfs2_qd_shrink_scan) tried to access
already-freed objects on the LRU list.

Fix this by removing qd objects from the LRU list before freeing them in
qd_put().

Initial fix from Deepanshu Kartikey <kartikey406@gmail.com>.

Fixes: a475c5dd16 ("gfs2: Free quota data objects synchronously")
Reported-by: syzbot+046b605f01802054bff0@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=046b605f01802054bff0
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-02-26 14:58:58 -08:00
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README 

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 reStructuredText 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.