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netfilter: replace -EEXIST with -EBUSY

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The -EEXIST error code is reserved by the module loading infrastructure
to indicate that a module is already loaded. When a module's init
function returns -EEXIST, userspace tools like kmod interpret this as
"module already loaded" and treat the operation as successful, returning
0 to the user even though the module initialization actually failed.

Replace -EEXIST with -EBUSY to ensure correct error reporting in the module
initialization path.

Affected modules:
  * ebtable_broute ebtable_filter ebtable_nat arptable_filter
  * ip6table_filter ip6table_mangle ip6table_nat ip6table_raw
  * ip6table_security iptable_filter iptable_mangle iptable_nat
  * iptable_raw iptable_security

Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Daniel Gomez 2025-12-19 06:13:20 +01:00 committed by Florian Westphal
parent 36a3200575
commit 2bafeb8d2f
3 changed files with 4 additions and 4 deletions
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2
net/bridge/netfilter/ebtables.c
View File

@ -1299,7 +1299,7 @@ int ebt_register_template(const struct ebt_table *t, int (*table_init)(struct ne
list_for_each_entry(tmpl, &template_tables, list) {
if (WARN_ON_ONCE(strcmp(t->name, tmpl->name) == 0)) {
mutex_unlock(&ebt_mutex);
return -EEXIST;
return -EBUSY;
}
}

4
net/netfilter/nf_log.c
View File

@ -89,7 +89,7 @@ int nf_log_register(u_int8_t pf, struct nf_logger *logger)
if (pf == NFPROTO_UNSPEC) {
for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) {
if (rcu_access_pointer(loggers[i][logger->type])) {
ret = -EEXIST;
ret = -EBUSY;
goto unlock;
}
}
@ -97,7 +97,7 @@ int nf_log_register(u_int8_t pf, struct nf_logger *logger)
rcu_assign_pointer(loggers[i][logger->type], logger);
} else {
if (rcu_access_pointer(loggers[pf][logger->type])) {
ret = -EEXIST;
ret = -EBUSY;
goto unlock;
}
rcu_assign_pointer(loggers[pf][logger->type], logger);

2
net/netfilter/x_tables.c
View File

@ -1764,7 +1764,7 @@ EXPORT_SYMBOL_GPL(xt_hook_ops_alloc);
int xt_register_template(const struct xt_table *table,
int (*table_init)(struct net *net))
{
int ret = -EEXIST, af = table->af;
int ret = -EBUSY, af = table->af;
struct xt_template *t;
mutex_lock(&xt[af].mutex);