Hangbin Liu c0a47e44c0
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: c40e89fd35alexey.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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