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Commit bb1553c8 authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller
Browse files

ip_tunnel: Add sanity checks to ip_tunnel_encap_add_ops() 



The symbols are exported and could be used by external modules.

Fixes: a8c5f9 ("ip_tunnel: Ops registration for secondary encap (fou, gue)")
Signed-off-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c9f2c3d3

net/ipv4/ip_tunnel.c

+6 −0
Original line number Diff line number Diff line
@@ -514,6 +514,9 @@ const struct ip_tunnel_encap_ops __rcu * 
int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops,

			    unsigned int num)

{

	if (num >= MAX_IPTUN_ENCAP_OPS)

		return -ERANGE;



	return !cmpxchg((const struct ip_tunnel_encap_ops **)

			&iptun_encaps[num],

			NULL, ops) ? 0 : -1;
@@ -525,6 +528,9 @@ int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops, 
{

	int ret;



	if (num >= MAX_IPTUN_ENCAP_OPS)

		return -ERANGE;



	ret = (cmpxchg((const struct ip_tunnel_encap_ops **)

		       &iptun_encaps[num],

		       ops, NULL) == ops) ? 0 : -1;