Re: net/tcp: null-ptr-deref in __inet_lookup_listener/inet_exact_dif_match

[Andrey Konovalov]

Hi David,

I'm able to reproduce it, so I'd be happy to test your fix.

Thanks!

On Wed, Nov 2, 2016 at 7:31 PM, David Ahern <dsa@xxxxxxxxxxxxxxxxxxx> wrote:
> On 11/2/16 11:21 AM, Eric Dumazet wrote:
>> Thanks for your report.
>>
>> David, please take a look.
>>
>> TCP MD5 can call __inet_lookup_listener() with a NULL skb.
>
> interesting. I did not test md5 before sending, but doing so now I am not able to trigger the panic with any combination of passwords - correct, wrong, none, no listener, etc. perhaps I am missing a sysctl setting.
>
> Will send a fix. I see the call to __inet_lookup_listener with null skb.
>
>>
>> Bug added in commit a04a480d4392ea6efd117be2de564117b2a009c0
>