linux-kernel - Re: [PATCH][next] USB: EHCI: ehci-mv: fix less than zero comparison of an unsigned int

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Message-ID: <20200516063045.GA3846431@kroah.com>
Date:   Sat, 16 May 2020 08:30:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Colin King <colin.king@...onical.com>,
        Zhang Shengju <zhangshengju@...s.chinamobile.com>,
        Tang Bin <tangbin@...s.chinamobile.com>,
        linux-usb@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] USB: EHCI: ehci-mv: fix less than zero comparison
 of an unsigned int

On Fri, May 15, 2020 at 01:21:21PM -0400, Alan Stern wrote:
> On Fri, May 15, 2020 at 05:54:53PM +0100, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > The comparison of hcd->irq to less than zero for an error check will
> > never be true because hcd->irq is an unsigned int.  Fix this by
> > assigning the int retval to the return of platform_get_irq and checking
> > this for the -ve error condition and assigning hcd->irq to retval.
> > 
> > Addresses-Coverity: ("Unsigned compared against 0")
> > Fixes: c856b4b0fdb5 ("USB: EHCI: ehci-mv: fix error handling in mv_ehci_probe()")
> > Signed-off-by: Colin Ian King <colin.king@...onical.com>
> > ---
> 
> Thanks to Coverity for spotting this.  Any reason why it didn't spot 
> exactly the same mistake in the ohci-da8xx.c driver?

I think Coverity only runs on a limited kernel configuration and does
not build everything :(