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geneve: should not call rt6_lookup() when ipv6 was disabled

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When we add a new GENEVE device with IPv6 remote, checking only for
IS_ENABLED(CONFIG_IPV6) is not enough as we may disable IPv6 in the
kernel command line (ipv6.disable=1), and calling rt6_lookup() would
cause a NULL pointer dereference.

v2:
- don't mix declarations and code (reported by Stefano Brivio, Eric Dumazet)
- there's no need to use in6_dev_get() as we only need to check that
  idev exists (reported by David Ahern). This is under RTNL, so we can
  simply use __in6_dev_get() instead (Stefano, Eric).

Reported-by: Jianlin Shi <jishi@redhat.com>
Fixes: c40e89fd358e9 ("geneve: configure MTU based on a lower device")
Cc: Alexey Kodanev <alexey.kodanev@oracle.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>
This commit is contained in:
Hangbin Liu 2019-02-07 18:36:10 +08:00 committed by David S. Miller
parent e8c32c32b4
commit c0a47e44c0
1 changed files with 7 additions and 3 deletions
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10
drivers/net/geneve.c
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@ -1512,9 +1512,13 @@ static void geneve_link_config(struct net_device *dev,
}
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6: {
struct rt6_info *rt = rt6_lookup(geneve->net,
&info->key.u.ipv6.dst, NULL, 0,
NULL, 0);
struct rt6_info *rt;
if (!__in6_dev_get(dev))
break;
rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
NULL, 0);
if (rt && rt->dst.dev)
ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;