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When a directory entry is not found, ocfs2_dx_dir_lookup_rec() prints an error message that unconditionally dereferences the 'rec' pointer. However, if 'rec' is NULL, this leads to a NULL pointer dereference and a kernel panic. Add an explicit check empty extent list to avoid dereferencing NULL 'rec' pointer. Link: https://lkml.kernel.org/r/20250708001009.372263-1-ipravdin.official@gmail.com Reported-by: syzbot+20282c1b2184a857ac4c@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd7e29.050a0220.e1a89.0007.GAE@google.com/ Signed-off-by: Ivan Pravdin <ipravdin.official@gmail.com> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Jun Piao <piaojun@huawei.com> 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 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.