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ipv6: move stub initialization after ipv6 setup completion

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The ipv6 stub pointer is currently initialized before the ipv6
routing subsystem: a 3rd party can access and use such stub
before the routing data is ready.
Moreover, such pointer is not cleared in case of initialization
error, possibly leading to dangling pointers usage.

This change addresses the above moving the stub initialization
at the end of ipv6 init code.

Fixes: 5f81bd2e5d ("ipv6: export a stub for IPv6 symbols used by vxlan")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2017-04-24 14:18:28 +02:00 committed by David S. Miller
parent 72ec0bc64b
commit b7d6df5751
1 changed files with 4 additions and 2 deletions
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6
net/ipv6/af_inet6.c
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@ -933,8 +933,6 @@ static int __init inet6_init(void)
if (err)
goto igmp_fail;
ipv6_stub = &ipv6_stub_impl;
err = ipv6_netfilter_init();
if (err)
goto netfilter_fail;
@ -1010,6 +1008,10 @@ static int __init inet6_init(void)
if (err)
goto sysctl_fail;
#endif
/* ensure that ipv6 stubs are visible only after ipv6 is ready */
wmb();
ipv6_stub = &ipv6_stub_impl;
out:
return err;