linux-kernel - Re: [PATCH v2 1/2] Fix corner case in bad block table handling.

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Message-ID: <ccc99c80-6771-4f04-11d9-752b7b13a5a4@kontron.de>
Date:   Mon, 24 Jan 2022 15:11:14 +0100
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        sashal@...nel.org
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        vigneshr@...com, miquel.raynal@...tlin.com,
        Yoshio Furuyama <ytc-mb-yfuruyama7@...xia.com>, richard@....at,
        Stoll Eberhard <Eberhard.Stoll@...tron.de>
Subject: Re: [PATCH v2 1/2] Fix corner case in bad block table handling.

Hi Greg, Sasha,

just a gentle ping for the backport request below.

Thanks!

Am 11.01.22 um 16:33 schrieb Frieder Schrempf:
> Hi stable maintainers,
> 
> On 06.04.21 03:47, Yoshio Furuyama wrote:
>> From: "Doyle, Patrick" <pdoyle@...bot.com>
>>
>> In the unlikely event that both blocks 10 and 11 are marked as bad (on a
>> 32 bit machine), then the process of marking block 10 as bad stomps on
>> cached entry for block 11.  There are (of course) other examples.
>>
>> Signed-off-by: Patrick Doyle <pdoyle@...bot.com>
>> Reviewed-by: Richard Weinberger <richard@....at>
> 
> We have systems on which this patch fixes real failures. Could you
> please add the upstream patch fd0d8d85f723 ("mtd: nand: bbt: Fix corner
> case in bad block table handling") to the stable queues for 4.19, 5.4, 5.10?
> 
> Thanks!
> 
> Cc: stable@...r.kernel.org
> Fixes: 9c3736a3de21 ("mtd: nand: Add core infrastructure to deal with
> NAND devices")
> 
>> ---
>>  drivers/mtd/nand/bbt.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/nand/bbt.c b/drivers/mtd/nand/bbt.c
>> index 044adf913854..64af6898131d 100644
>> --- a/drivers/mtd/nand/bbt.c
>> +++ b/drivers/mtd/nand/bbt.c
>> @@ -123,7 +123,7 @@ int nanddev_bbt_set_block_status(struct nand_device *nand, unsigned int entry,
>>  		unsigned int rbits = bits_per_block + offs - BITS_PER_LONG;
>>  
>>  		pos[1] &= ~GENMASK(rbits - 1, 0);
>> -		pos[1] |= val >> rbits;
>> +		pos[1] |= val >> (bits_per_block - rbits);
>>  	}
>>  
>>  	return 0;