linux-kernel - Re: [PATCH] usb: dwc3: imx8mp: request irq after initializing dwc3

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Date:   Fri, 20 Aug 2021 13:06:33 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Nadezda Lutovinova <lutovinova@...ras.ru>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] usb: dwc3: imx8mp: request irq after initializing dwc3


Nadezda Lutovinova <lutovinova@...ras.ru> writes:

> If IRQ occurs between calling  devm_request_threaded_irq() and
> initializing dwc3_imx->dwc3, then null pointer dereference occurs
> since dwc3_imx->dwc3 is used in dwc3_imx8mp_interrupt().
>
> The patch puts registration of the interrupt handler after
> initializing of neccesery data.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Nadezda Lutovinova <lutovinova@...ras.ru>

Acked-by: Felipe Balbi <balbi@...nel.org>

-- 
balbi