linux-kernel - Re: [PATCH] usb: mtu3: Fix possible use-before-initialization bug

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Message-ID: <2023070559-removable-emotion-70f1@gregkh>
Date:   Wed, 5 Jul 2023 08:16:18 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yu Hao <yhao016@....edu>
Cc:     chunfeng.yun@...iatek.com, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: mtu3: Fix possible use-before-initialization bug

On Tue, Jul 04, 2023 at 04:25:50PM -0700, Yu Hao wrote:
> The struct usb_ctrlrequest setup should be initialized in the function
> ep0_read_setup(mtu, &setup). However, inside that function,
> the variable count could be 0 and the struct usb_ctrlrequest setup
> is not initialized. But there is a read for setup.bRequestType.
> 
> Signed-off-by: Yu Hao <yhao016@....edu>
> ---
>  drivers/usb/mtu3/mtu3_gadget_ep0.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/mtu3/mtu3_gadget_ep0.c
> b/drivers/usb/mtu3/mtu3_gadget_ep0.c
> index e4fd1bb14a55..67034fa515d0 100644
> --- a/drivers/usb/mtu3/mtu3_gadget_ep0.c
> +++ b/drivers/usb/mtu3/mtu3_gadget_ep0.c
> @@ -638,7 +638,7 @@ static int ep0_handle_setup(struct mtu3 *mtu)
>  __releases(mtu->lock)
>  __acquires(mtu->lock)
>  {
> -   struct usb_ctrlrequest setup;
> +   struct usb_ctrlrequest setup = {};
>     struct mtu3_request *mreq;
>     int handled = 0;
> 
> -- 
> 2.34.1

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- Your patch is malformed (tabs converted to spaces, linewrapped, etc.)
  and can not be applied.  Please read the file,
  Documentation/process/email-clients.rst in order to fix this.

If you wish to discuss this problem further, or you have questions about
how to resolve this issue, please feel free to respond to this email and
Greg will reply once he has dug out from the pending patches received
from other developers.

thanks,

greg k-h's patch email bot