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authorPaolo Abeni <pabeni@redhat.com>2017-04-24 14:18:28 +0200
committerDavid S. Miller <davem@davemloft.net>2017-04-25 11:43:16 -0400
commitb7d6df57516f8e6a1c847b822ec2a62555455f88 (patch)
tree43d9faf0dde9e65a188eac09d951d937c423b3f6 /net
parent72ec0bc64b9a5d8e0efcb717abfc757746b101b7 (diff)
downloadlinux-b7d6df57516f8e6a1c847b822ec2a62555455f88.tar.bz2
ipv6: move stub initialization after ipv6 setup completion
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: 5f81bd2e5d80 ("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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/af_inet6.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index a9a9553ee63d..e82e59f22dfc 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -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;