linux-kernel - Re: [PATCH] Fix error-code overwrite bug

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Message-ID: <CAHp75VeZnmsRLV6_gg9Wci03ZEJCk=dRDEkp7DsEubypVvCi3A@mail.gmail.com>
Date:	Wed, 7 Jan 2015 20:37:29 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Giel van Schijndel <me@...tis.eu>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"open list:MEMORY TECHNOLOGY..." <linux-mtd@...ts.infradead.org>
Subject: Re: [PATCH] Fix error-code overwrite bug

On Sun, Jan 4, 2015 at 8:04 PM, Giel van Schijndel <me@...tis.eu> wrote:
> Don't overwrite the returned error code with the boolean test used by
> the if-statement (otherwise it'd be 1 or 0 always, 1 in the if-block).
> ---
>  drivers/mtd/nftlmount.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/nftlmount.c b/drivers/mtd/nftlmount.c
> index 51b9d6a..1cbeb6b 100644
> --- a/drivers/mtd/nftlmount.c
> +++ b/drivers/mtd/nftlmount.c
> @@ -91,7 +91,7 @@ static int find_boot_record(struct NFTLrecord *nftl)
>                 /* To be safer with BIOS, also use erase mark as discriminant */
>                 if ((ret = nftl_read_oob(mtd, block * nftl->EraseSize +
>                                          SECTORSIZE + 8, 8, &retlen,
> -                                        (char *)&h1) < 0)) {
> +                                        (char *)&h1)) < 0) {

Better to move ret = x(); outside of condition. See here:
http://permalink.gmane.org/gmane.linux.drivers.mtd/56922

P.S.If you are going to fix more, may you talk to me via some channel
like irc, jabber, etc?


>                         printk(KERN_WARNING "ANAND header found at 0x%x in mtd%d, but OOB data read failed (err %d)\n",
>                                block * nftl->EraseSize, nftl->mbd.mtd->index, ret);
>                         continue;
> --
> 2.1.4
>
> --
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-- 
With Best Regards,
Andy Shevchenko
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