linux-kernel - Re: [PATCH v2] iio: core: fix double free in iio_device_unregister

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Message-ID: <CAHp75VdAbhmd1UeFmyN1qPYOh-GKWmdStAC7WRSn91=UpDQ+Tw@mail.gmail.com>
Date:   Tue, 12 Oct 2021 23:27:56 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>, ars@...afoo.de,
        Jonathan Cameron <jic23@...nel.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: Re: [PATCH v2] iio: core: fix double free in iio_device_unregister_sysfs()

On Mon, Oct 11, 2021 at 12:12 PM Yang Yingliang
<yangyingliang@...wei.com> wrote:
>
> I got the double free report:
>
> BUG: KASAN: double-free or invalid-free in kfree+0xce/0x390
>
> CPU: 0 PID: 359 Comm: xrun Tainted: G        W         5.15.0-rc3-00109-g4dfd49fafc4d-dirty #474 523b7f3c65c42247635e2ac04a95f61f9f36678d
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
> Call Trace:
>  dump_stack_lvl+0xe2/0x152
>  print_address_description.constprop.7+0x21/0x150
>  kasan_report_invalid_free+0x6f/0xa0
>  __kasan_slab_free+0x125/0x140
>  slab_free_freelist_hook+0x10d/0x240
>  kfree+0xce/0x390
>  iio_device_unregister_sysfs+0x108/0x13b [industrialio]
>  iio_dev_release+0x9e/0x10e [industrialio]
>  device_release+0xa5/0x240
>  kobject_put+0x1e5/0x540
>  put_device+0x20/0x30
>  devm_iio_device_release+0x21/0x30 [industrialio]
>  release_nodes+0xc3/0x3b0
>  devres_release_group+0x1da/0x2c0
>  i2c_device_probe+0x628/0xbb0
>  really_probe+0x285/0xc30

Please, reduce this noise to the ~4-5 important lines only!

-- 
With Best Regards,
Andy Shevchenko