linux-kernel - Re: [PATCH] mtd: rawnand: vf610: Fix to check for NULL pointer dereference

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190401172651.158c05fe@xps13>
Date:   Mon, 1 Apr 2019 17:26:51 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Aditya Pakki <pakki001@....edu>
Cc:     kjlu@....edu, Stefan Agner <stefan@...er.ch>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: rawnand: vf610: Fix to check for NULL pointer
 dereference

Hi Aditya,

Aditya Pakki <pakki001@....edu> wrote on Mon, 18 Mar 2019 18:24:34
-0500:

> of_match_device can return NULL if there is no matching device is found.
> The patch avoids a potential NULL pointer dereference by checking for the
> return value and passing the error upstream.
> 
> Signed-off-by: Aditya Pakki <pakki001@....edu>
> ---
>  drivers/mtd/nand/raw/vf610_nfc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/mtd/nand/raw/vf610_nfc.c b/drivers/mtd/nand/raw/vf610_nfc.c
> index a662ca1970e5..946abbb275c3 100644
> --- a/drivers/mtd/nand/raw/vf610_nfc.c
> +++ b/drivers/mtd/nand/raw/vf610_nfc.c
> @@ -850,6 +850,8 @@ static int vf610_nfc_probe(struct platform_device *pdev)
>  	}
>  
>  	of_id = of_match_device(vf610_nfc_dt_ids, &pdev->dev);
> +	if (!of_id)
> +		return -ENODEV;
>  	nfc->variant = (enum vf610_nfc_variant)of_id->data;
>  
>  	for_each_available_child_of_node(nfc->dev->of_node, child) {


Applied to git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git
on nand/next with the title changed to

        mtd: rawnand: vf610: Avoid a potential NULL pointer dereference

and a space after the return statement.

Thanks,
Miquèl