From: Stephen Suryaputra <ssuryaextr@gmail.com>
To: David Ahern <dsahern@gmail.com>
Cc: Florian Westphal <fw@strlen.de>,
Andrea Mayer <andrea.mayer@uniroma2.it>,
Andrea Righi <andrea.righi@canonical.com>,
"David S. Miller" <davem@davemloft.net>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
David Ahern <dsahern@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Ahmed Abdelsalam <ahabdels@gmail.com>,
Paolo Lungaroni <paolo.lungaroni@uniroma2.it>,
Stefano Salsano <stefano.salsano@uniroma2.it>
Subject: Re: [PATCH] ipv6: fix NULL pointer dereference in ip6_output()
Date: Wed, 8 Dec 2021 11:34:14 -0500 [thread overview]
Message-ID: <20211208163414.GA747@ICIPI.localdomain> (raw)
In-Reply-To: <d6cacd7d-732c-4fad-576d-a7e9d9ca9537@gmail.com>
On Wed, Dec 08, 2021 at 08:46:37AM -0700, David Ahern wrote:
> On 12/8/21 3:51 AM, Florian Westphal wrote:
> > David Ahern <dsahern@gmail.com> wrote:
> >> On 12/7/21 5:21 PM, Andrea Mayer wrote:
> >>> + IP6CB(skb)->iif = skb->skb_iif;
> >>> [...]
> >>>
> >>> What do you think?
> >>>
> >>
> >> I like that approach over the need for a fall back in core ipv6 code.
> >
> > What if the device is removed after ->iif assignment and before dev lookup?
> >
>
> good point. SR6 should make sure the iif is not cleared, and the
> fallback to the skb->dev is still needed in case of delete.
Thanks for the explanation. I was thinking that ->iif can safely be
assumed to be valid. Florian's point that device can be removed is a
good one. My bad for not putting the check and thanks for fixing.
prev parent reply other threads:[~2021-12-08 16:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 16:34 [PATCH] ipv6: fix NULL pointer dereference in ip6_output() Andrea Righi
2021-12-07 15:51 ` David Ahern
2021-12-08 0:21 ` Andrea Mayer
2021-12-08 0:50 ` David Ahern
2021-12-08 10:51 ` Florian Westphal
2021-12-08 15:46 ` David Ahern
2021-12-08 16:34 ` Stephen Suryaputra [this message]
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