linux-kernel - Re: [PATCH] net: ifb error path loop fix

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Message-ID: <20070102103053.GA2798@ff.dom.local>
Date:	Tue, 2 Jan 2007 11:30:53 +0100
From:	Jarek Poplawski <jarkao2@...pl>
To:	David Miller <davem@...emloft.net>
Cc:	hadi@...erus.ca, netdev@...r.kernel.org, jeff@...zik.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ifb error path loop fix

On 02-01-2007 08:51, David Miller wrote:
> From: Mariusz Kozlowski <m.kozlowski@...land.pl>
> Date: Tue, 2 Jan 2007 00:55:51 +0100
> 
>> On error we should start freeing resources at [i-1] not [i-2].
>>
>> Signed-off-by: Mariusz Kozlowski <m.kozlowski@...land.pl>
> 
> Patch applied, thanks Mariusz.
> 
>> diff -upr linux-2.6.20-rc2-mm1-a/drivers/net/ifb.c linux-2.6.20-rc2-mm1-b/drivers/net/ifb.c
>> --- linux-2.6.20-rc2-mm1-a/drivers/net/ifb.c	2006-12-24 05:00:32.000000000 +0100
>> +++ linux-2.6.20-rc2-mm1-b/drivers/net/ifb.c	2007-01-02 00:25:34.000000000 +0100
>> @@ -271,8 +271,7 @@ static int __init ifb_init_module(void)
>>  	for (i = 0; i < numifbs && !err; i++)
>>  		err = ifb_init_one(i);
>>  	if (err) {
>> -		i--;
>> -		while (--i >= 0)
>> +		while (i--)
>>  			ifb_free_one(i);
>>  	}

After this patch:

for (i = 0 ...); // i == 0
err = ifb_init_one(i); // err != 0
i++; // i == 1
for (... !err ...); // break 

if (err) {
	while (i--) // i == 1 (when testing)
		ifb_free_one(i); // i == 0 (not initialized)
}

Btw. wasn't this place patched yet?

Regards,
Jarek P.
-
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