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Subject[PATCH 5.12 159/161] netfilter: nf_tables: missing error reporting for not selected expressions
Date
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>
---
net/netfilter/nf_tables_api.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3288,8 +3288,10 @@ static int nf_tables_newrule(struct net
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++;
}

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