From: Ryusuke Konishi konishi.ryusuke@gmail.com

stable inclusion from stable-v4.19.322 commit 35a9a7a7d94662146396199b0cfd95f9517cdd14 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IARYB6 CVE: CVE-2024-46781

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit 5787fcaab9eb5930f5378d6a1dd03d916d146622 upstream.

In an error injection test of a routine for mount-time recovery, KASAN found a use-after-free bug.

It turned out that if data recovery was performed using partial logs created by dsync writes, but an error occurred before starting the log writer to create a recovered checkpoint, the inodes whose data had been recovered were left in the ns_dirty_files list of the nilfs object and were not freed.

Fix this issue by cleaning up inodes that have read the recovery data if the recovery routine fails midway before the log writer starts.

Link: https://lkml.kernel.org/r/20240810065242.3701-1-konishi.ryusuke@gmail.com Fixes: 0f3e1c7f23f8 ("nilfs2: recovery functions") Signed-off-by: Ryusuke Konishi konishi.ryusuke@gmail.com Tested-by: Ryusuke Konishi konishi.ryusuke@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zeng Heng zengheng4@huawei.com --- fs/nilfs2/recovery.c | 35 +++++++++++++++++++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c index 18feb9c7c706..26b5523059b8 100644 --- a/fs/nilfs2/recovery.c +++ b/fs/nilfs2/recovery.c @@ -709,6 +709,33 @@ static void nilfs_finish_roll_forward(struct the_nilfs *nilfs, brelse(bh); }

+/** + * nilfs_abort_roll_forward - cleaning up after a failed rollforward recovery + * @nilfs: nilfs object + */ +static void nilfs_abort_roll_forward(struct the_nilfs *nilfs) +{ + struct nilfs_inode_info *ii, *n; + LIST_HEAD(head); + + /* Abandon inodes that have read recovery data */ + spin_lock(&nilfs->ns_inode_lock); + list_splice_init(&nilfs->ns_dirty_files, &head); + spin_unlock(&nilfs->ns_inode_lock); + if (list_empty(&head)) + return; + + set_nilfs_purging(nilfs); + list_for_each_entry_safe(ii, n, &head, i_dirty) { + spin_lock(&nilfs->ns_inode_lock); + list_del_init(&ii->i_dirty); + spin_unlock(&nilfs->ns_inode_lock); + + iput(&ii->vfs_inode); + } + clear_nilfs_purging(nilfs); +} + /** * nilfs_salvage_orphan_logs - salvage logs written after the latest checkpoint * @nilfs: nilfs object @@ -770,15 +797,19 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, nilfs_msg(sb, KERN_ERR, "error %d writing segment for recovery", err); - goto failed; + goto put_root; }

nilfs_finish_roll_forward(nilfs, ri); }

- failed: +put_root: nilfs_put_root(root); return err; + +failed: + nilfs_abort_roll_forward(nilfs); + goto put_root; }

/**