linux-kernel - [PATCH 4.4 91/92] hfsplus: stop workqueue when fill

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Message-Id: <20180524093207.886343038@linuxfoundation.org>
Date:   Thu, 24 May 2018 11:39:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        syzbot <syzbot+4f2e5f086147d543ab03@...kaller.appspotmail.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        "Ernesto A. Fernandez" <ernesto.mnd.fernandez@...il.com>,
        Vyacheslav Dubeyko <slava@...eyko.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.4 91/92] hfsplus: stop workqueue when fill_super() failed

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tetsuo Handa <penguin-kernel@...ove.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=a66f45e96fdbeb76b796bf46eb25ea878c42a6c9

Link: http://lkml.kernel.org/r/964a8b27-cd69-357c-fe78-76b066056201@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+4f2e5f086147d543ab03@...kaller.appspotmail.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: David Howells <dhowells@...hat.com>
Cc: Ernesto A. Fernandez <ernesto.mnd.fernandez@...il.com>
Cc: Vyacheslav Dubeyko <slava@...eyko.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/hfsplus/super.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -585,6 +585,7 @@ 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);