[PATCH net 2/2] netfilter: nfnetlink_cthelper: hit EBUSY on updates if size mismatches

[Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>]

The private helper data size cannot be updated. However, updates that
contain NFCTH_PRIV_DATA_LEN might bogusly hit EBUSY even if the size is
the same.

Fixes: 12f7a505331e ("netfilter: add user-space connection tracking helper infrastructure")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 net/netfilter/nfnetlink_cthelper.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nfnetlink_cthelper.c b/net/netfilter/nfnetlink_cthelper.c
index 322ac5dd5402..752b10cae524 100644
--- a/net/netfilter/nfnetlink_cthelper.c
+++ b/net/netfilter/nfnetlink_cthelper.c
@@ -380,10 +380,14 @@ static int
 nfnl_cthelper_update(const struct nlattr * const tb[],
 		     struct nf_conntrack_helper *helper)
 {
+	u32 size;
 	int ret;
 
-	if (tb[NFCTH_PRIV_DATA_LEN])
-		return -EBUSY;
+	if (tb[NFCTH_PRIV_DATA_LEN]) {
+		size = ntohl(nla_get_be32(tb[NFCTH_PRIV_DATA_LEN]));
+		if (size != helper->data_len)
+			return -EBUSY;
+	}
 
 	if (tb[NFCTH_POLICY]) {
 		ret = nfnl_cthelper_update_policy(helper, tb[NFCTH_POLICY]);
-- 
2.20.1