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net: sched: act_ipt: check for underflow in __tcf_ipt_init()

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If "td->u.target_size" is larger than sizeof(struct xt_entry_target) we
return -EINVAL.  But we don't check whether it's smaller than
sizeof(struct xt_entry_target) and that could lead to an out of bounds
read.

Fixes: 7ba699c604ab ("[NET_SCHED]: Convert actions from rtnetlink to new netlink API")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2018-09-22 16:46:48 +03:00 committed by David S. Miller
parent ee0b6f4834
commit aeadd93f2b
1 changed files with 1 additions and 1 deletions
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2
net/sched/act_ipt.c
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@ -135,7 +135,7 @@ static int __tcf_ipt_init(struct net *net, unsigned int id, struct nlattr *nla,
}
td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) {
if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) {
if (exists)
tcf_idr_release(*a, bind);
else