linux-kernel - Re: [PATCH] Revert "i2c: dev: switch from register

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Message-ID: <20160528160458.GA1614@katana>
Date:	Sat, 28 May 2016 18:04:58 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Erico Nunes <erico.nunes@...acom.ind.br>,
	kernel-janitors@...r.kernel.org, LKP <lkp@...org>
Subject: Re: [PATCH] Revert "i2c: dev: switch from register_chrdev to cdev
 API"

> These kinds of use after frees don't always cause a runtime problem.  I
> found it using static analysis, but I bet you could detect it if you
> enabled kasan.  The other option is to enable PAGE_POISONING?

Thanks, PAGE_POISONING did trigger the issue. So, I now picked up your
patch instead of the revert because I could verify the problem and the
proper solution. Thanks again.

What I still wonder: Which analysis reported the problem to you? I
always run sparse, smatch, cppcheck, and coccicheck on the patches when
applying and no-one reported the issue.

   Wolfram

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