Merge tag 'mm-hotfixes-stable-2023-05-18-15-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "Eight hotfixes. Four are cc:stable, the other four are for post-6.4
  issues, or aren't considered suitable for backporting"

* tag 'mm-hotfixes-stable-2023-05-18-15-52' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  MAINTAINERS: Cleanup Arm Display IP maintainers
  MAINTAINERS: repair pattern in DIALOG SEMICONDUCTOR DRIVERS
  nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode()
  mm: fix zswap writeback race condition
  mm: kfence: fix false positives on big endian
  zsmalloc: move LRU update from zs_map_object() to zs_malloc()
  mm: shrinkers: fix race condition on debugfs cleanup
  maple_tree: make maple state reusable after mas_empty_area()

1 files changed, 18 insertions, 0 deletions

diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 1310d2d5feb3..a8ce522ac747 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -917,6 +917,7 @@ void nilfs_evict_inode(struct inode *inode)
 	struct nilfs_transaction_info ti;
 	struct super_block *sb = inode->i_sb;
 	struct nilfs_inode_info *ii = NILFS_I(inode);
+	struct the_nilfs *nilfs;
 	int ret;
 
 	if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
@@ -929,6 +930,23 @@ void nilfs_evict_inode(struct inode *inode)
 
 	truncate_inode_pages_final(&inode->i_data);
 
+	nilfs = sb->s_fs_info;
+	if (unlikely(sb_rdonly(sb) || !nilfs->ns_writer)) {
+		/*
+		 * If this inode is about to be disposed after the file system
+		 * has been degraded to read-only due to file system corruption
+		 * or after the writer has been detached, do not make any
+		 * changes that cause writes, just clear it.
+		 * Do this check after read-locking ns_segctor_sem by
+		 * nilfs_transaction_begin() in order to avoid a race with
+		 * the writer detach operation.
+		 */
+		clear_inode(inode);
+		nilfs_clear_inode(inode);
+		nilfs_transaction_abort(sb);
+		return;
+	}
+
 	/* TODO: some of the following operations may fail.  */
 	nilfs_truncate_bmap(ii, 0);
 	nilfs_mark_inode_dirty(inode);