linux-kernel - Re: [usb-storage] usb: storage: suspicious code

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Message-ID: <1487142073.18610.1.camel@suse.com>
Date:   Wed, 15 Feb 2017 08:01:13 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        stern@...land.harvard.edu, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, usb-storage@...ts.one-eyed-alien.net,
        linux-kernel@...r.kernel.org,
        Peter Senna Tschudi <peter.senna@...il.com>
Subject: Re: [usb-storage] usb: storage: suspicious code

Am Dienstag, den 14.02.2017, 23:06 -0600 schrieb Gustavo A. R. Silva:

Hi,

> waitcount = 0;
> do {
>         result = jumpshot_get_status(us);
>         if (result != USB_STOR_TRANSPORT_GOOD) {
>                 // I have not experimented to find the smallest
> value.
>                 //
>                 msleep(50);
>         }
>         } while ((result != USB_STOR_TRANSPORT_GOOD) && (waitcount <
> 10));
> 
>         if (result != USB_STOR_TRANSPORT_GOOD)
>                 usb_stor_dbg(us, "Gah!  Waitcount = 10.  Bad
> write!?\n");
> 
> Variable 'waitcount' is never updated inside the do-while loop. So,
> either it isn't needed at all or line 316 should be modified
> (++waitcount < 10)

you are correct. Waitcount needs to be incremented.

	HTH
		Oliver