linux-kernel - Re: [syzbot] [usb?] KASAN: slab-use-after-free Write in usb_anchor_suspend

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Message-ID: <5919c39c-1ee4-262b-4ba1-f0e58088611d@suse.com>
Date:   Thu, 17 Aug 2023 14:16:26 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Alan Stern <stern@...land.harvard.edu>,
        syzbot <syzbot+d6b0b0ea0781c14b2ecf@...kaller.appspotmail.com>,
        Oliver Neukum <oneukum@...e.com>
Cc:     arnd@...db.de, christian.brauner@...ntu.com,
        gregkh@...uxfoundation.org, hdanton@...a.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        mpe@...erman.id.au, oleg@...hat.com,
        syzkaller-bugs@...glegroups.com, web@...kaller.appspotmail.com
Subject: Re: [syzbot] [usb?] KASAN: slab-use-after-free Write in
 usb_anchor_suspend_wakeups

On 12.08.23 17:56, Alan Stern wrote:
Hi,
  
> The real problem seems to be some sort of race in usbtmc and the core
> between URBs being added to an anchor, file I/O being stopped, and URBs
> being killed or scuttled when the file is flushed.

just to make sure, you think it is failing here:

usb_anchor_resume_wakeups(anchor);

because we cannot guarantee that the anchor pointer
is still valid, unless we refcount anchors, which would
make embedding them impossible?

	Regards
		Oliver