linux-kernel - Re: [PATCH] usb:host: fix divide-by-zero in function fhci_queue

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Message-ID: <20190416094545.GA896@kroah.com>
Date:   Tue, 16 Apr 2019 11:45:45 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     zhuyan <zhuyan34@...wei.com>
Cc:     anton@...msg.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb:host: fix divide-by-zero in function fhci_queue_urb

On Tue, Apr 09, 2019 at 10:37:12PM +0800, zhuyan wrote:
> In function fhci_queue_urb, the divisor of expression
> (urb->transfer_buffer_length % usb_maxpacket(urb->dev, urb->pipe,
> usb_pipeout(urb->pipe))) may be zero.

How can you hit that?

> When it is zero, unexpected results may occur, so it is necessary to
> ensure that the divisor is not zero.
> 
> Signed-off-by: zhuyan <zhuyan34@...wei.com>

I need a "Full" name here, not just a single name.  Whatever you use to
sign documents is good.

thanks,

greg k-h