On 2/27/17 4:07 PM, Cong Wang wrote:
> Andrey reported a NULL pointer deref bug in ipv6_route_ioctl()
> -> ip6_route_del() -> __ip6_del_rt_siblings() code path. This is
> because ip6_null_entry is returned in this path since ip6_null_entry
> is kinda default for a ipv6 route table root node. Quote from
> David Ahern:
>
> ip6_null_entry is the root of all ipv6 fib tables making it integrated
> into the table ...
>
> We should ignore any attempt of trying to delete it, like we do in
> __ip6_del_rt() path and several others.
>
> Reported-by: Andrey Konovalov <andreyk...@google.com>
> Fixes: 0ae8133586ad ("net: ipv6: Allow shorthand delete of all nexthops in
> multipath route")
> Cc: David Ahern <d...@cumulusnetworks.com>
> Cc: Eric Dumazet <eric.duma...@gmail.com>
> Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
> ---
> net/ipv6/route.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
Acked-by: David Ahern <d...@cumulusnetworks.com>
