nilfs2 fix kernel panic on directory operation after filesystem corruption

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Issue: After detecting filesystem corruption and degrading to read-only mode during directory operations, the function in nilfs2 may fail, causing the check to fail and triggering a kernel error. - Cause: When nilfs2 pages/volumes are discarded, the "checked" flag is not cleared, leading to skipped directory entry checks when the directory page/volume is reloaded. 2. Fixes: - Fix: Clear the "checked" flag in nilfs2's own page discard function. - Necessity: The "checked" flag must be cleared when using nilfs2's own page discard function. 3. Links and References: - Link: https://lkml.kernel.org/r/20241017193359.5051-1-konishi.ryusuke@gmail.com - Fix: 8c26c4e2694a ("nilfs2: fix issue with flush kernel thread after remount in RO mode because of driver's internal error or metadata corruption") - Reported by: syzbot+d6ca2daf692c7a82f959@syzkaller.appspotmail.com - Closed: https://syzkaller.appspot.com/bug?extid=d6ca2daf692c7a82f959 4. Authors and Contributors: - Author: Ryusuke Konishi - Contributors: Greg Kroah-Hartman, Andrew Morton 5. Code Changes: - File: fs/nilfs2/page.c - Change: Added function to clear the "checked" flag. This information provides a detailed overview of the vulnerability's context, mitigation steps, and associated links and contributors.

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nilfs2 fix kernel panic on directory operation after filesystem corruption