The patch titled
Subject: nilfs2: fix missing cleanup on rollforward recovery error
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
nilfs2-fix-missing-cleanup-on-rollforward-recovery-error.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nilfs2-fix-missing-cleanup-on-rollforward-recovery-error.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Subject: nilfs2: fix missing cleanup on rollforward recovery error
Date: Sat, 10 Aug 2024 15:52:42 +0900
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@xxxxxxxxx
Fixes: 0f3e1c7f23f8 ("nilfs2: recovery functions")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Tested-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/nilfs2/recovery.c | 35 +++++++++++++++++++++++++++++++++--
1 file changed, 33 insertions(+), 2 deletions(-)
--- a/fs/nilfs2/recovery.c~nilfs2-fix-missing-cleanup-on-rollforward-recovery-error
+++ a/fs/nilfs2/recovery.c
@@ -716,6 +716,33 @@ static void nilfs_finish_roll_forward(st
}
/**
+ * 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
* @sb: super block instance
@@ -773,15 +800,19 @@ int nilfs_salvage_orphan_logs(struct the
if (unlikely(err)) {
nilfs_err(sb, "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;
}
/**
_
Patches currently in -mm which might be from konishi.ryusuke@xxxxxxxxx are
nilfs2-protect-references-to-superblock-parameters-exposed-in-sysfs.patch
nilfs2-fix-missing-cleanup-on-rollforward-recovery-error.patch
