netdev - Re: [PATCH v3 01/14] NFC: fix attrs checks in netlink interface

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Date:   Fri, 26 Jul 2019 10:54:22 +0200 (CEST)
From:   Sedat Dilek <sedat.dilek@...dativ.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Clément Perrochaud 
        <clement.perrochaud@...innov.com>,
        Charles Gorand <charles.gorand@...innov.com>,
        netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v3 01/14] NFC: fix attrs checks in netlink interface

[ Please CC me I am not subscribed to this ML ]

Hi Andy,

unfortunately, I did not found a cover-letter on netdev mailing-list.
So, I am answering here.

What are the changes v2->v3?

Again, unfortunately I throw away all v2 out of my local linux Git repository.
So, I could have looked at the diff myself.

Thanks for v3 upgrade!

Regards,
- Sedat -

[1] https://marc.info/?a=131071969100005&r=1&w=2

> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> hat am 25. Juli 2019 21:34 geschrieben:
> 
>  
> From: Andrey Konovalov <andreyknvl@...gle.com>
> 
> nfc_genl_deactivate_target() relies on the NFC_ATTR_TARGET_INDEX
> attribute being present, but doesn't check whether it is actually
> provided by the user. Same goes for nfc_genl_fw_download() and
> NFC_ATTR_FIRMWARE_NAME.
> 
> This patch adds appropriate checks.
> 
> Found with syzkaller.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  net/nfc/netlink.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
> index 4a30309bb67f..60fd2748d0ea 100644
> --- a/net/nfc/netlink.c
> +++ b/net/nfc/netlink.c
> @@ -970,7 +970,8 @@ static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
>  	int rc;
>  	u32 idx;
>  
> -	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
> +	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
> +	    !info->attrs[NFC_ATTR_TARGET_INDEX])
>  		return -EINVAL;
>  
>  	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
> @@ -1018,7 +1019,8 @@ static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
>  	struct sk_buff *msg = NULL;
>  	u32 idx;
>  
> -	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
> +	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
> +	    !info->attrs[NFC_ATTR_FIRMWARE_NAME])
>  		return -EINVAL;
>  
>  	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
> -- 
> 2.20.1


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