linux-kernel - Re: [PATCH] usb: gadget: Check bmAttributes only if configuration is valid

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Message-ID: <2025022434-unveiling-handbook-6fc3@gregkh>
Date: Mon, 24 Feb 2025 10:06:01 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Prashanth K <prashanth.k@....qualcomm.com>
Cc: Kees Bakker <kees@...erbout.nl>,
	William McVicker <willmcvicker@...gle.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] usb: gadget: Check bmAttributes only if configuration is
 valid

On Mon, Feb 24, 2025 at 02:26:04PM +0530, Prashanth K wrote:
> If the USB configuration is not valid, then avoid checking for
> bmAttributes to prevent null pointer deference.
> 
> Cc: stable@...r.kernel.org
> Fixes: 40e89ff5750f ("usb: gadget: Set self-powered based on MaxPower and bmAttributes")
> Signed-off-by: Prashanth K <prashanth.k@....qualcomm.com>
> ---
>  drivers/usb/gadget/composite.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
> index 4bcf73bae761..869ad99afb48 100644
> --- a/drivers/usb/gadget/composite.c
> +++ b/drivers/usb/gadget/composite.c
> @@ -1051,7 +1051,7 @@ static int set_config(struct usb_composite_dev *cdev,
>  		usb_gadget_set_remote_wakeup(gadget, 0);
>  done:
>  	if (power > USB_SELF_POWER_VBUS_MAX_DRAW ||
> -	    !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER))
> +	    (c && !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER)))
>  		usb_gadget_clear_selfpowered(gadget);
>  	else
>  		usb_gadget_set_selfpowered(gadget);
> -- 
> 2.25.1
> 
> 

Have you checked linux-next yet for this fix that was posted last week?
Does that not resolve the issue for you?

thanks,

greg k-h