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Re: [PATCH] Revert "i2c: dev: switch from register_chrdev to cdev API"

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> 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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[PATCH] Revert "i2c: dev: switch from register_chrdev to cdev API" Wolfram Sang <wsa@the-dreams.de> - 2016-05-28 11:10 +0200
  Re: [PATCH] Revert "i2c: dev: switch from register_chrdev to cdev  API" Dan Carpenter <dan.carpenter@oracle.com> - 2016-05-28 11:20 +0200
    Re: [PATCH] Revert "i2c: dev: switch from register_chrdev to cdev  API" Wolfram Sang <wsa@the-dreams.de> - 2016-05-28 18:10 +0200
      Re: [PATCH] Revert "i2c: dev: switch from register_chrdev to cdev  API" Dan Carpenter <dan.carpenter@oracle.com> - 2016-05-30 09:10 +0200

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