[SRU][J/F/B] CVE-2022-3649

[Yuxuan Luo]

[Impact]
If the disk is already corrupted while the user is using NILFS, there exists
a situation that the file system would erroneously operate and crush.

[Backport]
The patch d325dc6eb763c10f591c239550b8c7e5466a5d09 can be cherry-picked to Jammy
cleanly. In addition to this, Focal and Bionic needs to cherry-pick commit
a1d0747a393a079631130d61faa2a61027d1c789 to use macro nilfs_warn and nilfs_info.

[Testing]
Compile tested.

[Potential Regression]
This patch does not alter any existing logic but add a handler for a rare
situation; therefore, there is no potential regression.

Ryusuke Konishi (1):
  nilfs2: fix use-after-free bug of struct nilfs_root

 fs/nilfs2/inode.c | 17 ++++++++++++++++-
 fs/nilfs2/nilfs.h |  5 +++++
 2 files changed, 21 insertions(+), 1 deletion(-)

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2.34.1