linux-kernel - Re: [PATCH] usb: cdnsp: Fix segmentation fault in cdns_lost

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Date:   Wed, 12 Jan 2022 20:56:15 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Pawel Laszczak <pawell@...ence.com>
Cc:     a-govindraju@...com, frank.li@....com, rogerq@...nel.org,
        gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] usb: cdnsp: Fix segmentation fault in cdns_lost_power
 function

On 22-01-11 10:07:37, Pawel Laszczak wrote:
> From: Pawel Laszczak <pawell@...ence.com>
> 
> CDNSP driver read not initialized cdns->otg_v0_regs
> which lead to segmentation fault. Patch fixes this issue.
> 
> Fixes: 2cf2581cd229 ("usb: cdns3: add power lost support for system resume")
> cc: <stable@...r.kernel.org>
> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
> ---
>  drivers/usb/cdns3/drd.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c
> index 55c73b1d8704..d00ff98dffab 100644
> --- a/drivers/usb/cdns3/drd.c
> +++ b/drivers/usb/cdns3/drd.c
> @@ -483,11 +483,11 @@ int cdns_drd_exit(struct cdns *cdns)
>  /* Indicate the cdns3 core was power lost before */
>  bool cdns_power_is_lost(struct cdns *cdns)
>  {
> -	if (cdns->version == CDNS3_CONTROLLER_V1) {
> -		if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))
> +	if (cdns->version == CDNS3_CONTROLLER_V0) {
> +		if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))
>  			return true;
>  	} else {
> -		if (!(readl(&cdns->otg_v0_regs->simulate) & BIT(0)))
> +		if (!(readl(&cdns->otg_v1_regs->simulate) & BIT(0)))
>  			return true;
>  	}
>  	return false;
> -- 

Pawel, may this lead cdns driver segment fault?

-- 

Thanks,
Peter Chen