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netfilter: conntrack: helper: Replace -EEXIST by -EBUSY

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[ Upstream commit 54416fd76770bd04fc3c501810e8d673550bab26 ]

The helper registration return value is passed-through by module_init
callbacks which modprobe confuses with the harmless -EEXIST returned
when trying to load an already loaded module.

Make sure modprobe fails so users notice their helper has not been
registered and won't work.

Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Fixes: 12f7a50533 ("netfilter: add user-space connection tracking helper infrastructure")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Phil Sutter 2025-08-18 13:22:20 +02:00 committed by Greg Kroah-Hartman
parent d00c8b0daf
commit c79730e337
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/nf_conntrack_helper.c
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@ -418,7 +418,7 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
(cur->tuple.src.l3num == NFPROTO_UNSPEC ||
cur->tuple.src.l3num == me->tuple.src.l3num) &&
cur->tuple.dst.protonum == me->tuple.dst.protonum) {
ret = -EEXIST;
ret = -EBUSY;
goto out;
}
}
@ -429,7 +429,7 @@ int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
hlist_for_each_entry(cur, &nf_ct_helper_hash[h], hnode) {
if (nf_ct_tuple_src_mask_cmp(&cur->tuple, &me->tuple,
&mask)) {
ret = -EEXIST;
ret = -EBUSY;
goto out;
}
}