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

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Date:   Fri, 26 Jul 2019 14:44:16 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Sedat Dilek <sedat.dilek@...dativ.de>
Cc:     Clément Perrochaud 
        <clement.perrochaud@...innov.com>,
        Charles Gorand <charles.gorand@...innov.com>,
        netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v3 01/14] NFC: fix attrs checks in netlink interface

On Fri, Jul 26, 2019 at 10:54:22AM +0200, Sedat Dilek wrote:
> [ 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?

I combined my 11 patches with 1 from syzkaller team and 2 from you.
That's only the change for the series.

Administratively I resent it to have updated Cc list.

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

It should be no changes in the code.

> 
> 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
> 
> 
> -- 
> Mit freundlichen Grüssen 
> Sedat Dilek
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-- 
With Best Regards,
Andy Shevchenko