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netfilter: ipset: fix a missing check of nla_parse

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[ Upstream commit f4f5748bfe ]

When nla_parse fails, we should not use the results (the first
argument). The fix checks if it fails, and if so, returns its error code
upstream.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aditya Pakki
2019-06-10 12:47:37 +02:00
committed by Greg Kroah-Hartman
parent 4c48018f78
commit acce347db8
1 changed files with 7 additions and 3 deletions
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10
net/netfilter/ipset/ip_set_core.c
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@@ -1541,10 +1541,14 @@ call_ad(struct sock *ctnl, struct sk_buff *skb, struct ip_set *set,
memcpy(&errmsg->msg, nlh, nlh->nlmsg_len);
cmdattr = (void *)&errmsg->msg + min_len;
nla_parse_deprecated(cda, IPSET_ATTR_CMD_MAX, cmdattr,
nlh->nlmsg_len - min_len,
ip_set_adt_policy, NULL);
ret = nla_parse_deprecated(cda, IPSET_ATTR_CMD_MAX, cmdattr,
nlh->nlmsg_len - min_len,
ip_set_adt_policy, NULL);
if (ret) {
nlmsg_free(skb2);
return ret;
}
errline = nla_data(cda[IPSET_ATTR_LINENO]);
*errline = lineno;