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A panic occurs in ocfs2_unlink due to WARN_ON(inode->i_nlink == 0) when handling a corrupted inode with i_mode=0 and i_nlink=0 in memory. This "zombie" inode is created because ocfs2_read_locked_inode proceeds even after ocfs2_validate_inode_block successfully validates a block that structurally looks okay (passes checksum, signature etc.) but contains semantically invalid data (specifically i_mode=0). The current validation function doesn't check for i_mode being zero. This results in an in-memory inode with i_mode=0 being added to the VFS cache, which later triggers the panic during unlink. Prevent this by adding an explicit check for (i_mode == 0, i_nlink == 0, non-orphan) within ocfs2_validate_inode_block. If the check is true, return -EFSCORRUPTED to signal corruption. This causes the caller (ocfs2_read_locked_inode) to invoke make_bad_inode(), correctly preventing the zombie inode from entering the cache. Link: https://lkml.kernel.org/r/20251202224507.53452-2-eraykrdg1@gmail.com Co-developed-by: Albin Babu Varghese <albinbabuvarghese20@gmail.com> Signed-off-by: Albin Babu Varghese <albinbabuvarghese20@gmail.com> Signed-off-by: Ahmet Eray Karadag <eraykrdg1@gmail.com> Reported-by: syzbot+55c40ae8a0e5f3659f2b@syzkaller.appspotmail.com Fixes: https://syzkaller.appspot.com/bug?extid=55c40ae8a0e5f3659f2b Link: https://lore.kernel.org/all/20251022222752.46758-2-eraykrdg1@gmail.com/T/ Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: David Hunter <david.hunter.linux@gmail.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> Cc: Heming Zhao <heming.zhao@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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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.