linux-kernel - Re: [PATCH V2] usb: common: ulpi: Fix crash in ulpi

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Message-ID: <YeWN1Hb0tpjDzn+C@kroah.com>
Date:   Mon, 17 Jan 2022 16:40:04 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH V2] usb: common: ulpi: Fix crash in ulpi_match()

On Mon, Jan 17, 2022 at 03:00:39PM +0000, Jon Hunter wrote:
> Commit 7495af930835 ("ARM: multi_v7_defconfig: Enable drivers for
> DragonBoard 410c") enables the CONFIG_PHY_QCOM_USB_HS for the ARM
> multi_v7_defconfig. Enabling this Kconfig is causing the kernel to crash
> on the Tegra20 Ventana platform in the ulpi_match() function.
> 
> The Qualcomm USB HS PHY driver that is enabled by CONFIG_PHY_QCOM_USB_HS,
> registers a ulpi_driver but this driver does not provide an 'id_table',
> so when ulpi_match() is called on the Tegra20 Ventana platform, it
> crashes when attempting to deference the id_table pointer which is not
> valid. The Qualcomm USB HS PHY driver uses device-tree for matching the
> ULPI driver with the device and so fix this crash by using device-tree
> for matching if the id_table is not valid.
> 
> Fixes: ef6a7bcfb01c ("usb: ulpi: Support device discovery via DT")
> Signed-off-by: Jon Hunter <jonathanh@...dia.com>

No cc: of stable since this is a bug going back to 4.11?

thanks,

greg k-h