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Commit a50fe0ff authored by Pan Bian's avatar Pan Bian Committed by David S. Miller
Browse files

lwtunnel: check return value of nla_nest_start 



Function nla_nest_start() may return a NULL pointer on error. However,
in function lwtunnel_fill_encap(), the return value of nla_nest_start()
is not validated before it is used. This patch checks the return value
of nla_nest_start() against NULL.

Signed-off-by: default avatarPan Bian <bianpan2016@163.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 09d36071

net/core/lwtunnel.c

+2 −0
Original line number Diff line number Diff line
@@ -214,6 +214,8 @@ int lwtunnel_fill_encap(struct sk_buff *skb, struct lwtunnel_state *lwtstate) 


	ret = -EOPNOTSUPP;

	nest = nla_nest_start(skb, RTA_ENCAP);

	if (!nest)

		goto nla_put_failure;

	rcu_read_lock();

	ops = rcu_dereference(lwtun_encaps[lwtstate->type]);

	if (likely(ops && ops->fill_encap))