On Wed, 10 May 2023 00:29:56 +0900 Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx> wrote: > During unmount process of nilfs2, nothing holds nilfs_root structure after > nilfs2 detaches its writer in nilfs_detach_log_writer(). However, since > nilfs_evict_inode() uses nilfs_root for some cleanup operations, it may > cause use-after-free read if inodes are left in "garbage_list" and > released by nilfs_dispose_list() at the end of nilfs_detach_log_writer(). > > Fix this issue by modifying nilfs_evict_inode() to only clear inode > without additional metadata changes that use nilfs_root if the file system > is degraded to read-only or the writer is detached. > > ... > > --- 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; `the_nilfs' is unused - I'll zap it.
