geneve: should not call rt6_lookup() when ipv6 was disabled
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: c40e89fd35
("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>
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@ -1512,8 +1512,12 @@ static void geneve_link_config(struct net_device *dev,
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}
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#if IS_ENABLED(CONFIG_IPV6)
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case AF_INET6: {
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struct rt6_info *rt = rt6_lookup(geneve->net,
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&info->key.u.ipv6.dst, NULL, 0,
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struct rt6_info *rt;
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if (!__in6_dev_get(dev))
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break;
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rt = rt6_lookup(geneve->net, &info->key.u.ipv6.dst, NULL, 0,
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NULL, 0);
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if (rt && rt->dst.dev)
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