linux-kernel - Re: [PATCH 1/2] mtd: rawnand: docg4: fix NULL deref while probing

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Message-ID: <20180708134430.2ad78f6e@xps13>
Date:   Sun, 8 Jul 2018 13:44:30 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Sergey Larin <cerg2010cerg2010@...l.ru>
Cc:     boris.brezillon@...tlin.com, richard@....at, dwmw2@...radead.org,
        computersforpeace@...il.com, marek.vasut@...il.com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mtd: rawnand: docg4: fix NULL deref while probing

Hi Sergey,

Sergey Larin <cerg2010cerg2010@...l.ru> wrote on Sun,  8 Jul 2018
14:29:23 +0300:

> nand_scan_tail() invokes nand_chip->scan_bbt() at the end, which is not set
> by the driver. Use the default nand_default_bbt() function to avoid NULL
> dereferncing.

dereferencing

> 
> Signed-off-by: Sergey Larin <cerg2010cerg2010@...l.ru>

Maybe a Fixes/stable tags would be appropriate here if this is a real
runtime error?

> ---
>  drivers/mtd/nand/raw/docg4.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mtd/nand/raw/docg4.c b/drivers/mtd/nand/raw/docg4.c
> index bb96cb33cd6b..bbed8ea7858c 100644
> --- a/drivers/mtd/nand/raw/docg4.c
> +++ b/drivers/mtd/nand/raw/docg4.c
> @@ -1269,6 +1269,7 @@ static void __init init_mtd_structs(struct mtd_info *mtd)
>  	nand->read_buf = docg4_read_buf;
>  	nand->write_buf = docg4_write_buf16;
>  	nand->erase = docg4_erase_block;
> +	nand->scan_bbt = nand_default_bbt;
>  	nand->set_features = nand_get_set_features_notsupp;
>  	nand->get_features = nand_get_set_features_notsupp;
>  	nand->ecc.read_page = docg4_read_page;



-- 
Miquel Raynal, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com