linux-kernel - Re: WARNING in gpio_to

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Date:   Tue, 16 Jul 2019 23:52:19 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     syzbot <syzbot+cf35b76f35e068a1107f@...kaller.appspotmail.com>,
        Johan Hovold <johan@...nel.org>,
        Vincent Cuissard <cuissard@...vell.com>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-usb <linux-usb@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in gpio_to_desc

On Wed, Jul 10, 2019 at 1:07 PM syzbot
<syzbot+cf35b76f35e068a1107f@...kaller.appspotmail.com> wrote:

> HEAD commit:    7829a896 usb-fuzzer: main usb gadget fuzzer driver
(...)
>   __gpio_set_value include/asm-generic/gpio.h:104 [inline]
>   gpio_set_value include/linux/gpio.h:71 [inline]
>   nfcmrvl_chip_halt+0x4e/0x70 drivers/nfc/nfcmrvl/main.c:259
>   nfcmrvl_nci_register_dev+0x2d4/0x378 drivers/nfc/nfcmrvl/main.c:176
>   nfcmrvl_probe+0x4e9/0x5e0 drivers/nfc/nfcmrvl/usb.c:344

This bug is somewhere in the drivers/nfc/nfcmrvl* code handling
GPIOs.

It should be converted to GPIO descriptors and fixed up, see
drivers/gpio/TODO for details on how to do this.

Johan/Vincent, tell me if you want me to forward the full fuzzing
robot crash dump.

Yours,
Linus Walleij