linux-kernel - Re: [PATCH] farsync: fix invalid memory accesses in fst_add_one() and fst_init

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Date:	Tue, 08 Jul 2014 16:20:27 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	khoroshilov@...ras.ru
Cc:	kevin.curtis@...site.co.uk, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] farsync: fix invalid memory accesses in fst_add_one()
 and fst_init_card()

From: Alexey Khoroshilov <khoroshilov@...ras.ru>
Date: Tue, 08 Jul 2014 18:40:32 -0400

> On 08.07.2014 18:20, David Miller wrote:
>> From: Alexey Khoroshilov <khoroshilov@...ras.ru>
>> Date: Sat,  5 Jul 2014 03:35:50 +0400
>>
>>> -                }
>>> +			card->nports = i;
>>> +			return (card->nports == 0) ? err : 0;
>>> +		}
>> I don't think this is the right thing to do.
>>
>> This will cause the caller to not free the IRQ or any of the
>> other resources.
> My understanding of the existing code is to proceed if at least one port
> is available.
> So I return error code if no ports available at all, otherwise
> initialization continues and can succeed.
> If something else goes wrong, all resources are deallocated.
> 
> Do you suggest to return error code unconditionally?

Yes, that is my suggestion.

I'm also weary of so many changes to a driver that gets so little
usage and probably next to no testing at all.
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