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![Vincent Duvert](/assets/img/avatar_default.png)
Add a missing return statement to atalk_proc_init so it doesn't return
-ENOMEM when successful. This allows the appletalk module to load
properly.
Fixes: e2bcd8b0ce
("appletalk: use remove_proc_subtree to simplify procfs code")
Link: https://www.downtowndougbrown.com/2020/08/hacking-up-a-fix-for-the-broken-appletalk-kernel-module-in-linux-5-1-and-newer/
Reported-by: Christopher KOBAYASHI <chris@disavowed.jp>
Reported-by: Doug Brown <doug@downtowndougbrown.com>
Signed-off-by: Vincent Duvert <vincent.ldev@duvert.net>
[lukas: add missing tags]
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: stable@vger.kernel.org # v5.1+
Cc: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
242 lines
5.3 KiB
C
242 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* atalk_proc.c - proc support for Appletalk
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*
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* Copyright(c) Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*/
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <linux/atalk.h>
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#include <linux/export.h>
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static __inline__ struct atalk_iface *atalk_get_interface_idx(loff_t pos)
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{
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struct atalk_iface *i;
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for (i = atalk_interfaces; pos && i; i = i->next)
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--pos;
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return i;
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}
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static void *atalk_seq_interface_start(struct seq_file *seq, loff_t *pos)
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__acquires(atalk_interfaces_lock)
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{
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loff_t l = *pos;
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read_lock_bh(&atalk_interfaces_lock);
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return l ? atalk_get_interface_idx(--l) : SEQ_START_TOKEN;
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}
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static void *atalk_seq_interface_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct atalk_iface *i;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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i = NULL;
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if (atalk_interfaces)
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i = atalk_interfaces;
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goto out;
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}
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i = v;
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i = i->next;
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out:
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return i;
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}
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static void atalk_seq_interface_stop(struct seq_file *seq, void *v)
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__releases(atalk_interfaces_lock)
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{
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read_unlock_bh(&atalk_interfaces_lock);
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}
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static int atalk_seq_interface_show(struct seq_file *seq, void *v)
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{
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struct atalk_iface *iface;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq, "Interface Address Networks "
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"Status\n");
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goto out;
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}
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iface = v;
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seq_printf(seq, "%-16s %04X:%02X %04X-%04X %d\n",
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iface->dev->name, ntohs(iface->address.s_net),
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iface->address.s_node, ntohs(iface->nets.nr_firstnet),
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ntohs(iface->nets.nr_lastnet), iface->status);
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out:
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return 0;
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}
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static __inline__ struct atalk_route *atalk_get_route_idx(loff_t pos)
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{
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struct atalk_route *r;
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for (r = atalk_routes; pos && r; r = r->next)
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--pos;
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return r;
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}
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static void *atalk_seq_route_start(struct seq_file *seq, loff_t *pos)
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__acquires(atalk_routes_lock)
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{
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loff_t l = *pos;
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read_lock_bh(&atalk_routes_lock);
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return l ? atalk_get_route_idx(--l) : SEQ_START_TOKEN;
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}
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static void *atalk_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct atalk_route *r;
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++*pos;
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if (v == SEQ_START_TOKEN) {
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r = NULL;
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if (atalk_routes)
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r = atalk_routes;
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goto out;
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}
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r = v;
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r = r->next;
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out:
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return r;
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}
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static void atalk_seq_route_stop(struct seq_file *seq, void *v)
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__releases(atalk_routes_lock)
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{
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read_unlock_bh(&atalk_routes_lock);
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}
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static int atalk_seq_route_show(struct seq_file *seq, void *v)
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{
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struct atalk_route *rt;
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if (v == SEQ_START_TOKEN) {
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seq_puts(seq, "Target Router Flags Dev\n");
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goto out;
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}
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if (atrtr_default.dev) {
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rt = &atrtr_default;
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seq_printf(seq, "Default %04X:%02X %-4d %s\n",
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ntohs(rt->gateway.s_net), rt->gateway.s_node,
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rt->flags, rt->dev->name);
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}
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rt = v;
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seq_printf(seq, "%04X:%02X %04X:%02X %-4d %s\n",
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ntohs(rt->target.s_net), rt->target.s_node,
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ntohs(rt->gateway.s_net), rt->gateway.s_node,
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rt->flags, rt->dev->name);
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out:
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return 0;
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}
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static void *atalk_seq_socket_start(struct seq_file *seq, loff_t *pos)
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__acquires(atalk_sockets_lock)
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{
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read_lock_bh(&atalk_sockets_lock);
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return seq_hlist_start_head(&atalk_sockets, *pos);
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}
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static void *atalk_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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return seq_hlist_next(v, &atalk_sockets, pos);
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}
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static void atalk_seq_socket_stop(struct seq_file *seq, void *v)
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__releases(atalk_sockets_lock)
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{
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read_unlock_bh(&atalk_sockets_lock);
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}
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static int atalk_seq_socket_show(struct seq_file *seq, void *v)
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{
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struct sock *s;
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struct atalk_sock *at;
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if (v == SEQ_START_TOKEN) {
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seq_printf(seq, "Type Local_addr Remote_addr Tx_queue "
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"Rx_queue St UID\n");
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goto out;
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}
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s = sk_entry(v);
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at = at_sk(s);
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seq_printf(seq, "%02X %04X:%02X:%02X %04X:%02X:%02X %08X:%08X "
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"%02X %u\n",
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s->sk_type, ntohs(at->src_net), at->src_node, at->src_port,
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ntohs(at->dest_net), at->dest_node, at->dest_port,
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sk_wmem_alloc_get(s),
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sk_rmem_alloc_get(s),
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s->sk_state,
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from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)));
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out:
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return 0;
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}
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static const struct seq_operations atalk_seq_interface_ops = {
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.start = atalk_seq_interface_start,
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.next = atalk_seq_interface_next,
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.stop = atalk_seq_interface_stop,
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.show = atalk_seq_interface_show,
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};
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static const struct seq_operations atalk_seq_route_ops = {
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.start = atalk_seq_route_start,
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.next = atalk_seq_route_next,
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.stop = atalk_seq_route_stop,
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.show = atalk_seq_route_show,
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};
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static const struct seq_operations atalk_seq_socket_ops = {
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.start = atalk_seq_socket_start,
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.next = atalk_seq_socket_next,
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.stop = atalk_seq_socket_stop,
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.show = atalk_seq_socket_show,
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};
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int __init atalk_proc_init(void)
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{
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if (!proc_mkdir("atalk", init_net.proc_net))
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return -ENOMEM;
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if (!proc_create_seq("atalk/interface", 0444, init_net.proc_net,
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&atalk_seq_interface_ops))
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goto out;
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if (!proc_create_seq("atalk/route", 0444, init_net.proc_net,
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&atalk_seq_route_ops))
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goto out;
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if (!proc_create_seq("atalk/socket", 0444, init_net.proc_net,
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&atalk_seq_socket_ops))
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goto out;
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if (!proc_create_seq_private("atalk/arp", 0444, init_net.proc_net,
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&aarp_seq_ops,
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sizeof(struct aarp_iter_state), NULL))
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goto out;
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return 0;
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out:
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remove_proc_subtree("atalk", init_net.proc_net);
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return -ENOMEM;
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}
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void atalk_proc_exit(void)
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{
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remove_proc_subtree("atalk", init_net.proc_net);
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}
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