linux-hardening - RE: [PATCH net] net: ieee802154: adf7242: Fix some potential buffer overflow in adf7242_stats

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Date: Mon, 23 Oct 2023 06:24:16 +0000
From: "Hennerich, Michael" <Michael.Hennerich@...log.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "keescook@...omium.org" <keescook@...omium.org>,
        Alexander Aring
	<alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Miquel
 Raynal <miquel.raynal@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo
 Abeni <pabeni@...hat.com>,
        Marcel Holtmann <marcel@...tmann.org>
CC: "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        Stefan
 Schmidt <stefan@....samsung.com>,
        "linux-wpan@...r.kernel.org"
	<linux-wpan@...r.kernel.org>,
        "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
Subject: RE: [PATCH net] net: ieee802154: adf7242: Fix some potential buffer
 overflow in adf7242_stats_show()



> -----Original Message-----
> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Sent: Samstag, 21. Oktober 2023 20:04
> To: keescook@...omium.org; Hennerich, Michael
> <Michael.Hennerich@...log.com>; Alexander Aring <alex.aring@...il.com>;
> Stefan Schmidt <stefan@...enfreihafen.org>; Miquel Raynal
> <miquel.raynal@...tlin.com>; David S. Miller <davem@...emloft.net>; Eric
> Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo
> Abeni <pabeni@...hat.com>; Marcel Holtmann <marcel@...tmann.org>
> Cc: linux-hardening@...r.kernel.org; linux-kernel@...r.kernel.org; kernel-
> janitors@...r.kernel.org; Christophe JAILLET <christophe.jaillet@...adoo.fr>;
> Stefan Schmidt <stefan@....samsung.com>; linux-wpan@...r.kernel.org;
> netdev@...r.kernel.org
> Subject: [PATCH net] net: ieee802154: adf7242: Fix some potential buffer
> overflow in adf7242_stats_show()
> 
> 
> strncat() usage in adf7242_debugfs_init() is wrong.
> The size given to strncat() is the maximum number of bytes that can be written,
> excluding the trailing NULL.
> 
> Here, the size that is passed, DNAME_INLINE_LEN, does not take into account
> the size of "adf7242-" that is already in the array.
> 
> In order to fix it, use snprintf() instead.
> 
> Fixes: 7302b9d90117 ("ieee802154/adf7242: Driver for ADF7242 MAC
> IEEE802154")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---

Acked-by: Michael Hennerich <michael.hennerich@...log.com>

>  drivers/net/ieee802154/adf7242.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ieee802154/adf7242.c
> b/drivers/net/ieee802154/adf7242.c
> index a03490ba2e5b..cc7ddc40020f 100644
> --- a/drivers/net/ieee802154/adf7242.c
> +++ b/drivers/net/ieee802154/adf7242.c
> @@ -1162,9 +1162,10 @@ static int adf7242_stats_show(struct seq_file *file,
> void *offset)
> 
>  static void adf7242_debugfs_init(struct adf7242_local *lp)  {
> -	char debugfs_dir_name[DNAME_INLINE_LEN + 1] = "adf7242-";
> +	char debugfs_dir_name[DNAME_INLINE_LEN + 1];
> 
> -	strncat(debugfs_dir_name, dev_name(&lp->spi->dev),
> DNAME_INLINE_LEN);
> +	snprintf(debugfs_dir_name, sizeof(debugfs_dir_name),
> +		 "adf7242-%s", dev_name(&lp->spi->dev));
> 
>  	lp->debugfs_root = debugfs_create_dir(debugfs_dir_name, NULL);
> 
> --
> 2.34.1