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* [PATCH] can: gw: Fix error path of cgw_module_init
@ 2019-05-16 15:54 ` YueHaibing
  0 siblings, 0 replies; 6+ messages in thread
From: YueHaibing @ 2019-05-16 15:54 UTC (permalink / raw)
  To: davem, socketcan, mkl; +Cc: linux-kernel, netdev, linux-can, YueHaibing

This patch fix error path for cgw_module_init
to avoid possible crash if some error occurs.

Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 net/can/gw.c | 46 +++++++++++++++++++++++++++++++---------------
 1 file changed, 31 insertions(+), 15 deletions(-)

diff --git a/net/can/gw.c b/net/can/gw.c
index 53859346..8b53ec7 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -1046,32 +1046,48 @@ static __init int cgw_module_init(void)
 	pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
 		max_hops);
 
-	register_pernet_subsys(&cangw_pernet_ops);
+	ret = register_pernet_subsys(&cangw_pernet_ops);
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
 	cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
 				      0, 0, NULL);
-
 	if (!cgw_cache)
-		return -ENOMEM;
+		goto out_cache_create;
 
 	/* set notifier */
 	notifier.notifier_call = cgw_notifier;
-	register_netdevice_notifier(&notifier);
+	ret = register_netdevice_notifier(&notifier);
+	if (ret)
+		goto out_register_notifier;
 
 	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
 				   NULL, cgw_dump_jobs, 0);
-	if (ret) {
-		unregister_netdevice_notifier(&notifier);
-		kmem_cache_destroy(cgw_cache);
-		return -ENOBUFS;
-	}
-
-	/* Only the first call to rtnl_register_module can fail */
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
-			     cgw_create_job, NULL, 0);
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
-			     cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register1;
+
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
+				   cgw_create_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register2;
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
+				   cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register2;
 
 	return 0;
+
+out_rtnl_register2:
+	rtnl_unregister_all(PF_CAN);
+out_rtnl_register1:
+	unregister_netdevice_notifier(&notifier);
+out_register_notifier:
+	kmem_cache_destroy(cgw_cache);
+out_cache_create:
+	unregister_pernet_subsys(&cangw_pernet_ops);
+
+	return ret;
 }
 
 static __exit void cgw_module_exit(void)
-- 
1.8.3.1

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH] can: gw: Fix error path of cgw_module_init
@ 2019-05-16 15:54 ` YueHaibing
  0 siblings, 0 replies; 6+ messages in thread
From: YueHaibing @ 2019-05-16 15:54 UTC (permalink / raw)
  To: davem, socketcan, mkl; +Cc: linux-kernel, netdev, linux-can, YueHaibing

This patch fix error path for cgw_module_init
to avoid possible crash if some error occurs.

Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 net/can/gw.c | 46 +++++++++++++++++++++++++++++++---------------
 1 file changed, 31 insertions(+), 15 deletions(-)

diff --git a/net/can/gw.c b/net/can/gw.c
index 53859346..8b53ec7 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -1046,32 +1046,48 @@ static __init int cgw_module_init(void)
 	pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
 		max_hops);
 
-	register_pernet_subsys(&cangw_pernet_ops);
+	ret = register_pernet_subsys(&cangw_pernet_ops);
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
 	cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
 				      0, 0, NULL);
-
 	if (!cgw_cache)
-		return -ENOMEM;
+		goto out_cache_create;
 
 	/* set notifier */
 	notifier.notifier_call = cgw_notifier;
-	register_netdevice_notifier(&notifier);
+	ret = register_netdevice_notifier(&notifier);
+	if (ret)
+		goto out_register_notifier;
 
 	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
 				   NULL, cgw_dump_jobs, 0);
-	if (ret) {
-		unregister_netdevice_notifier(&notifier);
-		kmem_cache_destroy(cgw_cache);
-		return -ENOBUFS;
-	}
-
-	/* Only the first call to rtnl_register_module can fail */
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
-			     cgw_create_job, NULL, 0);
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
-			     cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register1;
+
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
+				   cgw_create_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register2;
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
+				   cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register2;
 
 	return 0;
+
+out_rtnl_register2:
+	rtnl_unregister_all(PF_CAN);
+out_rtnl_register1:
+	unregister_netdevice_notifier(&notifier);
+out_register_notifier:
+	kmem_cache_destroy(cgw_cache);
+out_cache_create:
+	unregister_pernet_subsys(&cangw_pernet_ops);
+
+	return ret;
 }
 
 static __exit void cgw_module_exit(void)
-- 
1.8.3.1



^ permalink raw reply related	[flat|nested] 6+ messages in thread
* Re: [PATCH] can: gw: Fix error path of cgw_module_init
  2019-05-16 15:54 ` YueHaibing
  (?)
@ 2019-05-16 16:24 ` Oliver Hartkopp
  -1 siblings, 0 replies; 6+ messages in thread
From: Oliver Hartkopp @ 2019-05-16 16:24 UTC (permalink / raw)
  To: YueHaibing, davem, mkl; +Cc: linux-kernel, netdev, linux-can



On 16.05.19 17:54, YueHaibing wrote:
> This patch fix error path for cgw_module_init
> to avoid possible crash if some error occurs.
> 
> Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>

Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>

Thanks!

> ---
>   net/can/gw.c | 46 +++++++++++++++++++++++++++++++---------------
>   1 file changed, 31 insertions(+), 15 deletions(-)
> 
> diff --git a/net/can/gw.c b/net/can/gw.c
> index 53859346..8b53ec7 100644
> --- a/net/can/gw.c
> +++ b/net/can/gw.c
> @@ -1046,32 +1046,48 @@ static __init int cgw_module_init(void)
>   	pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
>   		max_hops);
>   
> -	register_pernet_subsys(&cangw_pernet_ops);
> +	ret = register_pernet_subsys(&cangw_pernet_ops);
> +	if (ret)
> +		return ret;
> +
> +	ret = -ENOMEM;
>   	cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
>   				      0, 0, NULL);
> -
>   	if (!cgw_cache)
> -		return -ENOMEM;
> +		goto out_cache_create;
>   
>   	/* set notifier */
>   	notifier.notifier_call = cgw_notifier;
> -	register_netdevice_notifier(&notifier);
> +	ret = register_netdevice_notifier(&notifier);
> +	if (ret)
> +		goto out_register_notifier;
>   
>   	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
>   				   NULL, cgw_dump_jobs, 0);
> -	if (ret) {
> -		unregister_netdevice_notifier(&notifier);
> -		kmem_cache_destroy(cgw_cache);
> -		return -ENOBUFS;
> -	}
> -
> -	/* Only the first call to rtnl_register_module can fail */
> -	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
> -			     cgw_create_job, NULL, 0);
> -	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
> -			     cgw_remove_job, NULL, 0);
> +	if (ret)
> +		goto out_rtnl_register1;
> +
> +	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
> +				   cgw_create_job, NULL, 0);
> +	if (ret)
> +		goto out_rtnl_register2;
> +	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
> +				   cgw_remove_job, NULL, 0);
> +	if (ret)
> +		goto out_rtnl_register2;
>   
>   	return 0;
> +
> +out_rtnl_register2:
> +	rtnl_unregister_all(PF_CAN);
> +out_rtnl_register1:
> +	unregister_netdevice_notifier(&notifier);
> +out_register_notifier:
> +	kmem_cache_destroy(cgw_cache);
> +out_cache_create:
> +	unregister_pernet_subsys(&cangw_pernet_ops);
> +
> +	return ret;
>   }
>   
>   static __exit void cgw_module_exit(void)
> 

^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: [PATCH] can: gw: Fix error path of cgw_module_init
  2019-05-16 15:54 ` YueHaibing
  (?)
  (?)
@ 2019-05-17 10:40 ` Marc Kleine-Budde
  2019-05-18  9:35     ` YueHaibing
  -1 siblings, 1 reply; 6+ messages in thread
From: Marc Kleine-Budde @ 2019-05-17 10:40 UTC (permalink / raw)
  To: YueHaibing, davem, socketcan; +Cc: linux-kernel, netdev, linux-can


[-- Attachment #1.1: Type: text/plain, Size: 2922 bytes --]

On 5/16/19 5:54 PM, YueHaibing wrote:
> This patch fix error path for cgw_module_init
> to avoid possible crash if some error occurs.
> 
> Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  net/can/gw.c | 46 +++++++++++++++++++++++++++++++---------------
>  1 file changed, 31 insertions(+), 15 deletions(-)
> 
> diff --git a/net/can/gw.c b/net/can/gw.c
> index 53859346..8b53ec7 100644
> --- a/net/can/gw.c
> +++ b/net/can/gw.c
> @@ -1046,32 +1046,48 @@ static __init int cgw_module_init(void)
>  	pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
>  		max_hops);
>  
> -	register_pernet_subsys(&cangw_pernet_ops);
> +	ret = register_pernet_subsys(&cangw_pernet_ops);
> +	if (ret)
> +		return ret;
> +
> +	ret = -ENOMEM;
>  	cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
>  				      0, 0, NULL);
> -
>  	if (!cgw_cache)
> -		return -ENOMEM;
> +		goto out_cache_create;
>  
>  	/* set notifier */
>  	notifier.notifier_call = cgw_notifier;
> -	register_netdevice_notifier(&notifier);
> +	ret = register_netdevice_notifier(&notifier);
> +	if (ret)
> +		goto out_register_notifier;
>  
>  	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
>  				   NULL, cgw_dump_jobs, 0);
> -	if (ret) {
> -		unregister_netdevice_notifier(&notifier);
> -		kmem_cache_destroy(cgw_cache);
> -		return -ENOBUFS;
> -	}
> -
> -	/* Only the first call to rtnl_register_module can fail */
> -	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
> -			     cgw_create_job, NULL, 0);
> -	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
> -			     cgw_remove_job, NULL, 0);
> +	if (ret)
> +		goto out_rtnl_register1;
> +
> +	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
> +				   cgw_create_job, NULL, 0);
> +	if (ret)
> +		goto out_rtnl_register2;
> +	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
> +				   cgw_remove_job, NULL, 0);
> +	if (ret)
> +		goto out_rtnl_register2;
>  
>  	return 0;
> +
> +out_rtnl_register2:
> +	rtnl_unregister_all(PF_CAN);

Currently gw.c is the only user of rtnl_register_module(PF_CAN), but
PF_CAN is not specific to gw. Better change this to individual
rtnl_unregister(int protocol, int msgtype).

> +out_rtnl_register1:
> +	unregister_netdevice_notifier(&notifier);
> +out_register_notifier:
> +	kmem_cache_destroy(cgw_cache);
> +out_cache_create:
> +	unregister_pernet_subsys(&cangw_pernet_ops);
> +
> +	return ret;
>  }
>  
>  static __exit void cgw_module_exit(void)
> 

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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^ permalink raw reply	[flat|nested] 6+ messages in thread
* [PATCH v2] can: gw: Fix error path of cgw_module_init
  2019-05-17 10:40 ` Marc Kleine-Budde
@ 2019-05-18  9:35     ` YueHaibing
  0 siblings, 0 replies; 6+ messages in thread
From: YueHaibing @ 2019-05-18  9:35 UTC (permalink / raw)
  To: socketcan, mkl, davem; +Cc: linux-kernel, netdev, linux-can, YueHaibing

This patch add error path for cgw_module_init
to avoid possible crash if some error occurs.

Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 net/can/gw.c | 48 +++++++++++++++++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 15 deletions(-)

diff --git a/net/can/gw.c b/net/can/gw.c
index 53859346..bd21614 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -1046,32 +1046,50 @@ static __init int cgw_module_init(void)
 	pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
 		max_hops);
 
-	register_pernet_subsys(&cangw_pernet_ops);
+	ret = register_pernet_subsys(&cangw_pernet_ops);
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
 	cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
 				      0, 0, NULL);
-
 	if (!cgw_cache)
-		return -ENOMEM;
+		goto out_cache_create;
 
 	/* set notifier */
 	notifier.notifier_call = cgw_notifier;
-	register_netdevice_notifier(&notifier);
+	ret = register_netdevice_notifier(&notifier);
+	if (ret)
+		goto out_register_notifier;
 
 	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
 				   NULL, cgw_dump_jobs, 0);
-	if (ret) {
-		unregister_netdevice_notifier(&notifier);
-		kmem_cache_destroy(cgw_cache);
-		return -ENOBUFS;
-	}
-
-	/* Only the first call to rtnl_register_module can fail */
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
-			     cgw_create_job, NULL, 0);
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
-			     cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register1;
+
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
+				   cgw_create_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register2;
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
+				   cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register3;
 
 	return 0;
+
+out_rtnl_register3:
+	rtnl_unregister(PF_CAN, RTM_NEWROUTE);
+out_rtnl_register2:
+	rtnl_unregister(PF_CAN, RTM_GETROUTE);
+out_rtnl_register1:
+	unregister_netdevice_notifier(&notifier);
+out_register_notifier:
+	kmem_cache_destroy(cgw_cache);
+out_cache_create:
+	unregister_pernet_subsys(&cangw_pernet_ops);
+
+	return ret;
 }
 
 static __exit void cgw_module_exit(void)
-- 
1.8.3.1

^ permalink raw reply related	[flat|nested] 6+ messages in thread
* [PATCH v2] can: gw: Fix error path of cgw_module_init
@ 2019-05-18  9:35     ` YueHaibing
  0 siblings, 0 replies; 6+ messages in thread
From: YueHaibing @ 2019-05-18  9:35 UTC (permalink / raw)
  To: socketcan, mkl, davem; +Cc: linux-kernel, netdev, linux-can, YueHaibing

This patch add error path for cgw_module_init
to avoid possible crash if some error occurs.

Fixes: c1aabdf379bc ("can-gw: add netlink based CAN routing")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 net/can/gw.c | 48 +++++++++++++++++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 15 deletions(-)

diff --git a/net/can/gw.c b/net/can/gw.c
index 53859346..bd21614 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -1046,32 +1046,50 @@ static __init int cgw_module_init(void)
 	pr_info("can: netlink gateway (rev " CAN_GW_VERSION ") max_hops=%d\n",
 		max_hops);
 
-	register_pernet_subsys(&cangw_pernet_ops);
+	ret = register_pernet_subsys(&cangw_pernet_ops);
+	if (ret)
+		return ret;
+
+	ret = -ENOMEM;
 	cgw_cache = kmem_cache_create("can_gw", sizeof(struct cgw_job),
 				      0, 0, NULL);
-
 	if (!cgw_cache)
-		return -ENOMEM;
+		goto out_cache_create;
 
 	/* set notifier */
 	notifier.notifier_call = cgw_notifier;
-	register_netdevice_notifier(&notifier);
+	ret = register_netdevice_notifier(&notifier);
+	if (ret)
+		goto out_register_notifier;
 
 	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_GETROUTE,
 				   NULL, cgw_dump_jobs, 0);
-	if (ret) {
-		unregister_netdevice_notifier(&notifier);
-		kmem_cache_destroy(cgw_cache);
-		return -ENOBUFS;
-	}
-
-	/* Only the first call to rtnl_register_module can fail */
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
-			     cgw_create_job, NULL, 0);
-	rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
-			     cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register1;
+
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_NEWROUTE,
+				   cgw_create_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register2;
+	ret = rtnl_register_module(THIS_MODULE, PF_CAN, RTM_DELROUTE,
+				   cgw_remove_job, NULL, 0);
+	if (ret)
+		goto out_rtnl_register3;
 
 	return 0;
+
+out_rtnl_register3:
+	rtnl_unregister(PF_CAN, RTM_NEWROUTE);
+out_rtnl_register2:
+	rtnl_unregister(PF_CAN, RTM_GETROUTE);
+out_rtnl_register1:
+	unregister_netdevice_notifier(&notifier);
+out_register_notifier:
+	kmem_cache_destroy(cgw_cache);
+out_cache_create:
+	unregister_pernet_subsys(&cangw_pernet_ops);
+
+	return ret;
 }
 
 static __exit void cgw_module_exit(void)
-- 
1.8.3.1



^ permalink raw reply related	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2019-05-18  9:57 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-16 15:54 [PATCH] can: gw: Fix error path of cgw_module_init YueHaibing
2019-05-16 15:54 ` YueHaibing
2019-05-16 16:24 ` Oliver Hartkopp
2019-05-17 10:40 ` Marc Kleine-Budde
2019-05-18  9:35   ` [PATCH v2] " YueHaibing
2019-05-18  9:35     ` YueHaibing

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