Patch "netfilter: nf_tables_offload: return EOPNOTSUPP if rule specifies no actions" has been added to the 5.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    netfilter: nf_tables_offload: return EOPNOTSUPP if rule specifies no actions

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-nf_tables_offload-return-eopnotsupp-if-rul.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f6088ecb70d1d6cd77c56e4e293d08325654a268
Author: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Date:   Fri Dec 6 22:49:58 2019 +0100

    netfilter: nf_tables_offload: return EOPNOTSUPP if rule specifies no actions
    
    [ Upstream commit 81ec61074bcf68acfcb2820cda3ff9d9984419c7 ]
    
    If the rule only specifies the matching side, return EOPNOTSUPP.
    Otherwise, the front-end relies on the drivers to reject this rule.
    
    Fixes: c9626a2cbdb2 ("netfilter: nf_tables: add hardware offload support")
    Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
index 6f7eab502e65..e743f811245f 100644
--- a/net/netfilter/nf_tables_offload.c
+++ b/net/netfilter/nf_tables_offload.c
@@ -44,6 +44,9 @@ struct nft_flow_rule *nft_flow_rule_create(struct net *net,
 		expr = nft_expr_next(expr);
 	}
 
+	if (num_actions == 0)
+		return ERR_PTR(-EOPNOTSUPP);
+
 	flow = nft_flow_rule_alloc(num_actions);
 	if (!flow)
 		return ERR_PTR(-ENOMEM);