linux-kernel - Re: [PATCH] mtd: nand: Fix memory allocation in nanddev_bbt

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Message-ID: <9365718c-4993-7e3b-1519-8fef0c08c0db@kontron.de>
Date:   Tue, 27 Nov 2018 08:30:24 +0000
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
CC:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "David Woodhouse" <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: nand: Fix memory allocation in nanddev_bbt_init()

On 27.11.18 09:22, Boris Brezillon wrote:
> On Tue, 27 Nov 2018 07:44:52 +0000
> Schrempf Frieder <frieder.schrempf@...tron.de> wrote:
> 
>> Fix the size of the buffer allocated to store the in-memory BBT.
>> This bug was previously hidden by a different bug, that was fixed in
>> d098093ba06e.
> 
> Oops :-/.
> 
>>
>> Fixes: 9c3736a3de21 ("mtd: nand: Add core infrastructure to deal with NAND devices")
>> Cc: <stable@...r.kernel.org>
>> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
>> ---
>>   drivers/mtd/nand/bbt.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/nand/bbt.c b/drivers/mtd/nand/bbt.c
>> index 56cde38..c12497f 100644
>> --- a/drivers/mtd/nand/bbt.c
>> +++ b/drivers/mtd/nand/bbt.c
>> @@ -27,7 +27,8 @@ int nanddev_bbt_init(struct nand_device *nand)
>>   	unsigned int nwords = DIV_ROUND_UP(nblocks * bits_per_block,
>>   					   BITS_PER_LONG);
>>   
>> -	nand->bbt.cache = kzalloc(nwords, GFP_KERNEL);
>> +	nand->bbt.cache = kzalloc(nwords * (BITS_PER_LONG / BITS_PER_BYTE),
> 
> I prefer
> 
> 					 * sizeof(*nand->bbt.cache)
> If you're okay with this change, I'll fix it when applying (no need to
> send a new version).

Sure, that's ok.