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Subject[PATCH AUTOSEL 5.2 080/249] netfilter: ipset: fix a missing check of nla_parse
Date
From: Aditya Pakki <pakki001@umn.edu>

[ Upstream commit f4f5748bfec94cf418e49bf05f0c81a1b9ebc950 ]

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>
---
net/netfilter/ipset/ip_set_core.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c
index 3cdf171cd468..16afa0df4004 100644
--- a/net/netfilter/ipset/ip_set_core.c
+++ b/net/netfilter/ipset/ip_set_core.c
@@ -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;
--
2.20.1
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