linux-kernel - Re: [PATCH v3] i2c: dev: don't allow user-space to deadlock the kernel

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Message-ID: <Y9GpL9RBNM8H2ZSL@shikoro>
Date:   Wed, 25 Jan 2023 23:11:59 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3] i2c: dev: don't allow user-space to deadlock the
 kernel


> So, this code handled all my stress-testing well so far. I'll try to
> think of some more ideas until this evening, but likely I will apply it
> later. Nonetheless, more review eyes are still welcome!

Ah yes, I now recalled why I had the gut feeling that this solution is
not complete. See this mail thread from 2015:

https://lkml.iu.edu/hypermail/linux/kernel/1501.2/01700.html

There are still drivers using i2c_del_adapter()+kfree(), so removing the
completion could cause use-after-free there, or?


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