From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Sean Young <sean@mess.org>
Cc: Alan Stern <stern@rowland.harvard.edu>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Jarod Wilson <jarod@redhat.com>,
syzbot <syzbot+c558267ad910fc494497@syzkaller.appspotmail.com>,
andreyknvl@google.com, linux-media@vger.kernel.org,
linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [PATCH v2 (resend)] media: imon: reorganize serialization
Date: Mon, 2 May 2022 19:40:36 +0900 [thread overview]
Message-ID: <c0a519b5-22d9-ee55-c28e-777c0856198c@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <e144d930-7b82-3310-1163-dae9f7914fa9@I-love.SAKURA.ne.jp>
On 2022/05/02 19:26, Tetsuo Handa wrote:
> @@ -550,10 +548,15 @@ static int display_open(struct inode *inode, struct file *file)
>
> mutex_unlock(&ictx->lock);
>
> - if (retval && refcount_dec_and_test(&ictx->users))
> - free_imon_context(ictx);
> -
> + if (retval) {
> + mutex_unlock(&driver_lock);
Oops. This is mutex_lock(&driver_lock);.
> + if (refcount_dec_and_test(&ictx->users))
> + free_imon_context(ictx);
> + mutex_unlock(&driver_lock);
> + }
> + return retval;
> exit:
> + mutex_unlock(&driver_lock);
> return retval;
> }
>
But if you merely want to avoid adding "struct rcu_head rcu;" to "struct imon_context",
we can use synchronize_rcu(); kfree(ictx); sequence (at the cost of waiting for RCU
grace period inside free_imon_context()).
next prev parent reply other threads:[~2022-05-02 10:41 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 13:18 possible deadlock in display_open syzbot
2022-04-25 5:29 ` Tetsuo Handa
2022-04-25 9:20 ` Sean Young
2022-04-25 11:14 ` Tetsuo Handa
2022-04-25 11:56 ` Sean Young
2022-04-25 16:01 ` Alan Stern
2022-04-25 16:21 ` Sean Young
2022-04-26 0:54 ` [PATCH] media: imon: remove redundant serialization Tetsuo Handa
2022-04-26 7:57 ` Sean Young
2022-04-26 10:32 ` [PATCH v2] media: imon: reorganize serialization Tetsuo Handa
2022-05-02 3:49 ` [PATCH v2 (resend)] " Tetsuo Handa
2022-05-02 9:39 ` Sean Young
2022-05-02 10:26 ` Tetsuo Handa
2022-05-02 10:40 ` Tetsuo Handa [this message]
2022-05-02 10:46 ` Oliver Neukum
2022-05-02 11:05 ` Tetsuo Handa
2022-05-03 7:41 ` Oliver Neukum
2022-05-02 12:53 ` Greg KH
2022-05-02 13:04 ` Tetsuo Handa
2022-05-02 13:06 ` Greg KH
2022-05-02 13:40 ` Tetsuo Handa
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