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[ Upstream commitd5bf630f35] Before this patch, function signal_our_withdraw referenced the journal inode immediately. But corrupt file systems may have some invalid journals, in which case our attempt to read it in will withdraw and the resulting signal_our_withdraw would dereference the NULL value. This patch adds a check to signal_our_withdraw so that if the journal has not yet been initialized, it simply returns and does the old-style withdraw. Thanks, Andy Price, for his analysis. Reported-by: syzbot+50a8a9cf8127f2c6f5df@syzkaller.appspotmail.com Fixes:601ef0d52e("gfs2: Force withdraw to replay journals and wait for it to finish") Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.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.