From: Pablo Neira Ayuso <pablo@netfilter.org> -------------------------------- commit c781471d67a56d7d4c113669a11ede0463b5c719 upstream. Sometimes users forget to turn on nftables extensions from Kconfig that they need. In such case, the error reporting from userspace is misleading: $ sudo nft add rule x y counter Error: Could not process rule: No such file or directory add rule x y counter ^^^^^^^^^^^^^^^^^^^^ Add missing NL_SET_BAD_ATTR() to provide a hint: $ nft add rule x y counter Error: Could not process rule: No such file or directory add rule x y counter ^^^^^^^ Fixes: 83d9dcba06c5 ("netfilter: nf_tables: extended netlink error reporting for expressions") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: fanxingin <fanxingin@qq.com> --- net/netfilter/nf_tables_api.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 9a080767667b..168c87c1ac75 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3263,8 +3263,10 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk, if (n == NFT_RULE_MAXEXPRS) goto err1; err = nf_tables_expr_parse(&ctx, tmp, &info[n]); - if (err < 0) + if (err < 0) { + NL_SET_BAD_ATTR(extack, tmp); goto err1; + } size += info[n].ops->size; n++; } -- 2.23.0