linux-kernel - firewire: suspected uaf issue

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Message-ID: <TYCP286MB1188FABA20A0F8F3C6498E538A8E9@TYCP286MB1188.JPNP286.PROD.OUTLOOK.COM>
Date:   Fri, 5 Nov 2021 07:07:42 +0000
From:   YE Chengfeng <cyeaa@...nect.ust.hk>
To:     "stefanr@...6.in-berlin.de" <stefanr@...6.in-berlin.de>,
        "linux1394-devel@...ts.sourceforge.net" 
        <linux1394-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: firewire: suspected uaf issue

Hi,

We notice that after client_put(client); at #line 1316, client is dereferenced l(e.g., #line 1318), and we don't see any client_get(client) like statement before clientt_put(client). Could it be a uaf issue?

https://github.com/torvalds/linux/blob/master/drivers/firewire/core-cdev.c#L1316

Best regards.
Chengfeng