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

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Date:   Fri, 15 May 2020 18:26:04 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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 15/05/2020 18:21, 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?

No idea, it is curious that it can spot one error but miss another.
Sometimes I see these issues on the next scan, so it maybe the database
diff'ing is awry.

> 
> Also, why wasn't the patch CC'ed for the stable series?

My bad on that. Human error

> 
> Alan Stern
>