Like commit 1f17e2f2c8a8 ("net: ipv6: ignore null_entry on route dumps"), we need to ignore null entry in inet6_rtm_getroute() too.
Return -ENOENT here because we return the same errno when deleting the null entry. Fixes: a1a22c1206 ("net: ipv6: Keep nexthop of multipath route on admin down") Reported-by: Dmitry Vyukov <dvyu...@google.com> Cc: David Ahern <d...@cumulusnetworks.com> Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com> --- net/ipv6/route.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index f54f426..25590d1 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -3627,6 +3627,12 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); } + if (rt == net->ipv6.ip6_null_entry) { + ip6_rt_put(rt); + err = -ENOENT; + goto errout; + } + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); if (!skb) { ip6_rt_put(rt); -- 2.5.5