From: Dan Carpenter Date: Fri, 28 Apr 2017 13:03:48 +0000 (+0300) Subject: lwtunnel: fix error path in lwtunnel_fill_encap() X-Git-Tag: v4.12-rc1~129^2~41 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=39f37095990a39a0ee24f7621d06e9a6da6cd815;p=linux.git lwtunnel: fix error path in lwtunnel_fill_encap() 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: a50fe0ffd76f ("lwtunnel: check return value of nla_nest_start") Signed-off-by: Dan Carpenter Acked-by: David Ahern Signed-off-by: David S. Miller --- diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c index 5cbed3816229..cfae3d5fe11f 100644 --- a/net/core/lwtunnel.c +++ b/net/core/lwtunnel.c @@ -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))