4.9-stable review patch. If anyone has any objections, please let me know.
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From: linzhang xiaolou4617@gmail.com
[ Upstream commit 64df6d525fcff1630098db9238bfd2b3e092d5c1 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/x25.h | 4 ++-- net/x25/af_x25.c | 24 ++++++++++++++++-------- net/x25/sysctl_net_x25.c | 5 ++++- 3 files changed, 22 insertions(+), 11 deletions(-)
--- a/include/net/x25.h +++ b/include/net/x25.h @@ -298,10 +298,10 @@ void x25_check_rbuf(struct sock *);
/* sysctl_net_x25.c */ #ifdef CONFIG_SYSCTL -void x25_register_sysctl(void); +int x25_register_sysctl(void); void x25_unregister_sysctl(void); #else -static inline void x25_register_sysctl(void) {}; +static inline int x25_register_sysctl(void) { return 0; }; static inline void x25_unregister_sysctl(void) {}; #endif /* CONFIG_SYSCTL */
--- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -1790,32 +1790,40 @@ void x25_kill_by_neigh(struct x25_neigh
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;
rc = sock_register(&x25_family_ops); - if (rc != 0) + if (rc) goto out_proto;
dev_add_pack(&x25_packet_type);
rc = register_netdevice_notifier(&x25_dev_notifier); - if (rc != 0) + if (rc) goto out_sock;
- pr_info("Linux Version 0.2\n"); + rc = x25_register_sysctl(); + if (rc) + goto out_dev;
- x25_register_sysctl(); rc = x25_proc_init(); - if (rc != 0) - goto out_dev; + if (rc) + goto out_sysctl; + + pr_info("Linux Version 0.2\n"); + out: return rc; +out_sysctl: + x25_unregister_sysctl(); out_dev: unregister_netdevice_notifier(&x25_dev_notifier); out_sock: + dev_remove_pack(&x25_packet_type); sock_unregister(AF_X25); out_proto: proto_unregister(&x25_proto); --- a/net/x25/sysctl_net_x25.c +++ b/net/x25/sysctl_net_x25.c @@ -73,9 +73,12 @@ static struct ctl_table x25_table[] = { { 0, }, };
-void __init x25_register_sysctl(void) +int __init x25_register_sysctl(void) { 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)