4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp
commit 66072c29328717072fd84aaff3e070e3f008ba77 upstream.
syzbot is reporting ODEBUG messages at hfsplus_fill_super() [1]. This is because hfsplus_fill_super() forgot to call cancel_delayed_work_sync().
As far as I can see, it is hfsplus_mark_mdb_dirty() from hfsplus_new_inode() in hfsplus_fill_super() that calls queue_delayed_work(). Therefore, I assume that hfsplus_new_inode() does not fail if queue_delayed_work() was called, and the out_put_hidden_dir label is the appropriate location to call cancel_delayed_work_sync().
[1] https://syzkaller.appspot.com/bug?id=a66f45e96fdbeb76b796bf46eb25ea878c42a6c...
Link: http://lkml.kernel.org/r/964a8b27-cd69-357c-fe78-76b066056201@I-love.SAKURA.... Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Reported-by: syzbot syzbot+4f2e5f086147d543ab03@syzkaller.appspotmail.com Cc: Al Viro viro@zeniv.linux.org.uk Cc: David Howells dhowells@redhat.com Cc: Ernesto A. Fernandez ernesto.mnd.fernandez@gmail.com Cc: Vyacheslav Dubeyko slava@dubeyko.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/hfsplus/super.c | 1 + 1 file changed, 1 insertion(+)
--- a/fs/hfsplus/super.c +++ b/fs/hfsplus/super.c @@ -588,6 +588,7 @@ static int hfsplus_fill_super(struct sup return 0;
out_put_hidden_dir: + cancel_delayed_work_sync(&sbi->sync_work); iput(sbi->hidden_dir); out_put_root: dput(sb->s_root);