Re: [PATCH] ipv6: fix NULL pointer dereference in ip6_output()

[David Ahern]

On 12/8/21 3:51 AM, Florian Westphal wrote:
> David Ahern <dsahern@xxxxxxxxx> 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.