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net: x25: fix one potential use-after-free issue 

The function x25_init is not properly unregister related resources
on error handler.It is will result in kernel oops if x25_init init
failed, so add properly unregister call on error handler.

Also, i adjust the coding style and make x25_register_sysctl properly
return failure.

Signed-off-by: linzhang <xiaolou4617@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
linzhang 2017-05-17 12:05:07 +08:00 committed by David S. Miller
parent 3c2ce60bdd
commit 64df6d525f
3 changed files with 22 additions and 11 deletions
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4
include/net/x25.h
View File

@ -298,10 +298,10 @@ void x25_check_rbuf(struct sock *);
/* sysctl_net_x25.c */ /* sysctl_net_x25.c */
#ifdef CONFIG_SYSCTL #ifdef CONFIG_SYSCTL
void x25_register_sysctl(void); int x25_register_sysctl(void);
void x25_unregister_sysctl(void); void x25_unregister_sysctl(void);
#else #else
static inline void x25_register_sysctl(void) {}; static inline int x25_register_sysctl(void) { return 0; };
static inline void x25_unregister_sysctl(void) {}; static inline void x25_unregister_sysctl(void) {};
#endif /* CONFIG_SYSCTL */ #endif /* CONFIG_SYSCTL */

24
net/x25/af_x25.c
View File

@ -1791,32 +1791,40 @@ void x25_kill_by_neigh(struct x25_neigh *nb)
static int __init x25_init(void) static int __init x25_init(void)
{ {
int rc = proto_register(&x25_proto, 0); int rc;
if (rc != 0) rc = proto_register(&x25_proto, 0);
if (rc)
goto out; goto out;
rc = sock_register(&x25_family_ops); rc = sock_register(&x25_family_ops);
if (rc != 0) if (rc)
goto out_proto; goto out_proto;
dev_add_pack(&x25_packet_type); dev_add_pack(&x25_packet_type);
rc = register_netdevice_notifier(&x25_dev_notifier); rc = register_netdevice_notifier(&x25_dev_notifier);
if (rc != 0) if (rc)
goto out_sock; goto out_sock;
rc = x25_register_sysctl();
if (rc)
goto out_dev;
rc = x25_proc_init();
if (rc)
goto out_sysctl;
pr_info("Linux Version 0.2\n"); pr_info("Linux Version 0.2\n");
x25_register_sysctl();
rc = x25_proc_init();
if (rc != 0)
goto out_dev;
out: out:
return rc; return rc;
out_sysctl:
x25_unregister_sysctl();
out_dev: out_dev:
unregister_netdevice_notifier(&x25_dev_notifier); unregister_netdevice_notifier(&x25_dev_notifier);
out_sock: out_sock:
dev_remove_pack(&x25_packet_type);
sock_unregister(AF_X25); sock_unregister(AF_X25);
out_proto: out_proto:
proto_unregister(&x25_proto); proto_unregister(&x25_proto);

5
net/x25/sysctl_net_x25.c
View File

@ -73,9 +73,12 @@ static struct ctl_table x25_table[] = {
{ }, { },
}; };
void __init x25_register_sysctl(void) int __init x25_register_sysctl(void)
{ {
x25_table_header = register_net_sysctl(&init_net, "net/x25", x25_table); x25_table_header = register_net_sysctl(&init_net, "net/x25", x25_table);
if (!x25_table_header)
return -ENOMEM;
return 0;
} }
void x25_unregister_sysctl(void) void x25_unregister_sysctl(void)