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lwtunnel: fix error path in lwtunnel_fill_encap()

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We recently added a check to see if nla_nest_start() fails.  There are
two issues with that.  First, if it fails then I don't think we should
call nla_nest_cancel().  Second, it's slightly convoluted but the
current code returns success but we should return -EMSGSIZE instead.

Fixes: a50fe0ffd7 ("lwtunnel: check return value of nla_nest_start")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2017-04-28 16:03:48 +03:00 committed by David S. Miller
parent 77041e89ce
commit 39f3709599
1 changed files with 4 additions and 3 deletions
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7
net/core/lwtunnel.c
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@ -203,7 +203,7 @@ int lwtunnel_fill_encap(struct sk_buff *skb, struct lwtunnel_state *lwtstate)
{
const struct lwtunnel_encap_ops *ops;
struct nlattr *nest;
int ret = -EINVAL;
int ret;
if (!lwtstate)
return 0;
@ -212,10 +212,11 @@ int lwtunnel_fill_encap(struct sk_buff *skb, struct lwtunnel_state *lwtstate)
lwtstate->type > LWTUNNEL_ENCAP_MAX)
return 0;
ret = -EOPNOTSUPP;
nest = nla_nest_start(skb, RTA_ENCAP);
if (!nest)
goto nla_put_failure;
return -EMSGSIZE;
ret = -EOPNOTSUPP;
rcu_read_lock();
ops = rcu_dereference(lwtun_encaps[lwtstate->type]);
if (likely(ops && ops->fill_encap))