linux-kernel - [PATCH 5.10 140/145] netfilter: nft_dynset: report EOPNOTSUPP on missing set feature

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Date:   Mon, 11 Jan 2021 14:02:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 5.10 140/145] netfilter: nft_dynset: report EOPNOTSUPP on missing set feature

From: Pablo Neira Ayuso <pablo@...filter.org>

commit 95cd4bca7b1f4a25810f3ddfc5e767fb46931789 upstream.

If userspace requests a feature which is not available the original set
definition, then bail out with EOPNOTSUPP. If userspace sends
unsupported dynset flags (new feature not supported by this kernel),
then report EOPNOTSUPP to userspace. EINVAL should be only used to
report malformed netlink messages from userspace.

Fixes: 22fe54d5fefc ("netfilter: nf_tables: add support for dynamic set updates")
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nft_dynset.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -123,7 +123,7 @@ static int nft_dynset_init(const struct
 		u32 flags = ntohl(nla_get_be32(tb[NFTA_DYNSET_FLAGS]));
 
 		if (flags & ~NFT_DYNSET_F_INV)
-			return -EINVAL;
+			return -EOPNOTSUPP;
 		if (flags & NFT_DYNSET_F_INV)
 			priv->invert = true;
 	}
@@ -156,7 +156,7 @@ static int nft_dynset_init(const struct
 	timeout = 0;
 	if (tb[NFTA_DYNSET_TIMEOUT] != NULL) {
 		if (!(set->flags & NFT_SET_TIMEOUT))
-			return -EINVAL;
+			return -EOPNOTSUPP;
 
 		err = nf_msecs_to_jiffies64(tb[NFTA_DYNSET_TIMEOUT], &timeout);
 		if (err)
@@ -170,7 +170,7 @@ static int nft_dynset_init(const struct
 
 	if (tb[NFTA_DYNSET_SREG_DATA] != NULL) {
 		if (!(set->flags & NFT_SET_MAP))
-			return -EINVAL;
+			return -EOPNOTSUPP;
 		if (set->dtype == NFT_DATA_VERDICT)
 			return -EOPNOTSUPP;