sit: check if IPv6 enabled before calling ip6_err_gen_icmpv6_unreach()

[ Upstream commit 173656accaf583698bac3f9e269884ba60d51ef4 ]

If we disabled IPv6 from the kernel command line (ipv6.disable=1), we should
not call ip6_err_gen_icmpv6_unreach(). This:

  ip link add sit1 type sit local 192.0.2.1 remote 192.0.2.2 ttl 1
  ip link set sit1 up
  ip addr add 198.51.100.1/24 dev sit1
  ping 198.51.100.2

if IPv6 is disabled at boot time, will crash the kernel.

v2: there's no need to use in6_dev_get(), use __in6_dev_get() instead,
    as we only need to check that idev exists and we are under
    rcu_read_lock() (from netif_receive_skb_internal()).

Reported-by: Jianlin Shi <jishi@redhat.com>
Fixes: ca15a078bd90 ("sit: generate icmpv6 error when receiving icmpv4 error")
Cc: Oussama Ghorbel <ghorbel@pivasoftware.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index f7edc3007e2651f65c13358743e46b9585fee50c..d55cfae68491eccebb4dafcccaf273089d9da3d4 100644 (file)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -577,7 +577,7 @@ static int ipip6_err(struct sk_buff *skb, u32 info)
                goto out;
 
        err = 0;
-       if (!ipip6_err_gen_icmpv6_unreach(skb))
+       if (__in6_dev_get(skb->dev) && !ipip6_err_gen_icmpv6_unreach(skb))
                goto out;
 
        if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)