linux-kernel - Re: [PATCH 1/1] mtd: ubi: fix improper return value

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Message-ID: <c56efbcf-9398-0299-35d7-929f9a8c3dd6@gmail.com>
Date:   Sun, 4 Dec 2016 13:48:59 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     Pan Bian <bianpan201604@....com>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Pan Bian <bianpan2016@....com>
Subject: Re: [PATCH 1/1] mtd: ubi: fix improper return value

On 12/04/2016 07:12 AM, Pan Bian wrote:
> From: Pan Bian <bianpan2016@....com>
> 
> When __vmalloc() returns a NULL pointer, the region is not checked, and
> we cannot make sure that only 0xFF bytes are present at offset. Thus,
> returning 0 seems improper.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=189081
> 
> Signed-off-by: Pan Bian <bianpan2016@....com>
> ---
>  drivers/mtd/ubi/io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
> index b6fb8f9..b54fe05 100644
> --- a/drivers/mtd/ubi/io.c
> +++ b/drivers/mtd/ubi/io.c
> @@ -1413,7 +1413,7 @@ int ubi_self_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
>  	buf = __vmalloc(len, GFP_NOFS, PAGE_KERNEL);
>  	if (!buf) {
>  		ubi_err(ubi, "cannot allocate memory to check for 0xFFs");
> -		return 0;
> +		return -ENOMEM;

I wonder if you shouldn't also nuke the ubi_err() , because when you run
out of memory, printk() will likely also fail.

>  	}
>  
>  	err = mtd_read(ubi->mtd, addr, len, &read, buf);
> 


-- 
Best regards,
Marek Vasut