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Subject[PATCH] hfsplus: stop workqueue when fill_super() failed
From
Date
From ffd64dcf946502e7bb1d23c021ee9a4fc92f9312 Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Tue, 15 May 2018 12:23:03 +0900
Subject: [PATCH] hfsplus: stop workqueue when fill_super() failed

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

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

diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 9e690ae..80abba5 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -590,6 +590,7 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
return 0;

out_put_hidden_dir:
+ cancel_delayed_work_sync(&sbi->sync_work);
iput(sbi->hidden_dir);
out_put_root:
dput(sb->s_root);
--
1.8.3.1

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