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authorTakashi Iwai <tiwai@suse.de>2019-05-17 16:45:05 +0200
committerTakashi Iwai <tiwai@suse.de>2019-05-17 16:45:06 +0200
commit72cf41578ff4045b679a513c4936b45fa63122b9 (patch)
tree6e4d659797cea0ee0072e3061df77a45b707428d
parent51d84d734eb99d2ce9b7f4aa64610e2dee1dabb8 (diff)
appletalk: Fix use-after-free in atalk_proc_exit (bsc#1051510).
-rw-r--r--include/linux/atalk.h2
-rw-r--r--net/appletalk/atalk_proc.c2
-rw-r--r--net/appletalk/ddp.c37
-rw-r--r--net/appletalk/sysctl_net_atalk.c5
4 files changed, 37 insertions, 9 deletions
diff --git a/include/linux/atalk.h b/include/linux/atalk.h
index 73fd8b7e9534..716d53799d1f 100644
--- a/include/linux/atalk.h
+++ b/include/linux/atalk.h
@@ -150,7 +150,7 @@ extern int sysctl_aarp_retransmit_limit;
extern int sysctl_aarp_resolve_time;
#ifdef CONFIG_SYSCTL
-extern void atalk_register_sysctl(void);
+extern int atalk_register_sysctl(void);
extern void atalk_unregister_sysctl(void);
#else
#define atalk_register_sysctl() do { } while(0)
diff --git a/net/appletalk/atalk_proc.c b/net/appletalk/atalk_proc.c
index af46bc49e1e9..b5f84f428aa6 100644
--- a/net/appletalk/atalk_proc.c
+++ b/net/appletalk/atalk_proc.c
@@ -293,7 +293,7 @@ out_interface:
goto out;
}
-void __exit atalk_proc_exit(void)
+void atalk_proc_exit(void)
{
remove_proc_entry("interface", atalk_proc_dir);
remove_proc_entry("route", atalk_proc_dir);
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 5d035c1f1156..d1b68cc7da89 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1912,12 +1912,16 @@ static const char atalk_err_snap[] __initconst =
/* Called by proto.c on kernel start up */
static int __init atalk_init(void)
{
- int rc = proto_register(&ddp_proto, 0);
+ int rc;
- if (rc != 0)
+ rc = proto_register(&ddp_proto, 0);
+ if (rc)
goto out;
- (void)sock_register(&atalk_family_ops);
+ rc = sock_register(&atalk_family_ops);
+ if (rc)
+ goto out_proto;
+
ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
if (!ddp_dl)
printk(atalk_err_snap);
@@ -1925,12 +1929,33 @@ static int __init atalk_init(void)
dev_add_pack(&ltalk_packet_type);
dev_add_pack(&ppptalk_packet_type);
- register_netdevice_notifier(&ddp_notifier);
+ rc = register_netdevice_notifier(&ddp_notifier);
+ if (rc)
+ goto out_sock;
+
aarp_proto_init();
- atalk_proc_init();
- atalk_register_sysctl();
+ rc = atalk_proc_init();
+ if (rc)
+ goto out_aarp;
+
+ rc = atalk_register_sysctl();
+ if (rc)
+ goto out_proc;
out:
return rc;
+out_proc:
+ atalk_proc_exit();
+out_aarp:
+ aarp_cleanup_module();
+ unregister_netdevice_notifier(&ddp_notifier);
+out_sock:
+ dev_remove_pack(&ppptalk_packet_type);
+ dev_remove_pack(&ltalk_packet_type);
+ unregister_snap_client(ddp_dl);
+ sock_unregister(PF_APPLETALK);
+out_proto:
+ proto_unregister(&ddp_proto);
+ goto out;
}
module_init(atalk_init);
diff --git a/net/appletalk/sysctl_net_atalk.c b/net/appletalk/sysctl_net_atalk.c
index ebb864361f7a..4e6042e0fcac 100644
--- a/net/appletalk/sysctl_net_atalk.c
+++ b/net/appletalk/sysctl_net_atalk.c
@@ -44,9 +44,12 @@ static struct ctl_table atalk_table[] = {
static struct ctl_table_header *atalk_table_header;
-void atalk_register_sysctl(void)
+int __init atalk_register_sysctl(void)
{
atalk_table_header = register_net_sysctl(&init_net, "net/appletalk", atalk_table);
+ if (!atalk_table_header)
+ return -ENOMEM;
+ return 0;
}
void atalk_unregister_sysctl(void)