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: Pan Bian <bianpan2016@163.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -214,6 +214,8 @@ int lwtunnel_fill_encap(struct sk_buff *skb, struct lwtunnel_state *lwtstate)
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ret = -EOPNOTSUPP;
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nest = nla_nest_start(skb, RTA_ENCAP);
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if (!nest)
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goto nla_put_failure;
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rcu_read_lock();
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ops = rcu_dereference(lwtun_encaps[lwtstate->type]);
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if (likely(ops && ops->fill_encap))
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