* [PATCH] net: add mutex_unlock on xfrm4_protocol_register
@ 2018-04-19 1:08 sunlianwen
2018-04-19 5:18 ` Steffen Klassert
0 siblings, 1 reply; 2+ messages in thread
From: sunlianwen @ 2018-04-19 1:08 UTC (permalink / raw)
To: netdev
The function of xfrm4_protocol_register() don't release
the mutx lock, which potential cause deadlock.
Signed-off-by: Lianwen Sun <sunlw.fnst@cn.fujitsu.com>
---
net/ipv4/xfrm4_protocol.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/ipv4/xfrm4_protocol.c b/net/ipv4/xfrm4_protocol.c
index 8dd0e6ab8606..1ee34edef9d2 100644
--- a/net/ipv4/xfrm4_protocol.c
+++ b/net/ipv4/xfrm4_protocol.c
@@ -240,6 +240,10 @@ int xfrm4_protocol_register(struct xfrm4_protocol *handler,
ret = 0;
+ mutex_unlock(&xfrm4_protocol_mutex);
+
+ return ret;
+
err:
mutex_unlock(&xfrm4_protocol_mutex);
--
2.17.0
.
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] net: add mutex_unlock on xfrm4_protocol_register
2018-04-19 1:08 [PATCH] net: add mutex_unlock on xfrm4_protocol_register sunlianwen
@ 2018-04-19 5:18 ` Steffen Klassert
0 siblings, 0 replies; 2+ messages in thread
From: Steffen Klassert @ 2018-04-19 5:18 UTC (permalink / raw)
To: sunlianwen; +Cc: netdev
On Thu, Apr 19, 2018 at 09:08:57AM +0800, sunlianwen wrote:
> The function of xfrm4_protocol_register() don't release
> the mutx lock, which potential cause deadlock.
Can you please explain how this can happen?
>
> Signed-off-by: Lianwen Sun <sunlw.fnst@cn.fujitsu.com>
> ---
> net/ipv4/xfrm4_protocol.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/net/ipv4/xfrm4_protocol.c b/net/ipv4/xfrm4_protocol.c
> index 8dd0e6ab8606..1ee34edef9d2 100644
> --- a/net/ipv4/xfrm4_protocol.c
> +++ b/net/ipv4/xfrm4_protocol.c
> @@ -240,6 +240,10 @@ int xfrm4_protocol_register(struct xfrm4_protocol *handler,
>
> ret = 0;
>
> + mutex_unlock(&xfrm4_protocol_mutex);
> +
> + return ret;
> +
> err:
> mutex_unlock(&xfrm4_protocol_mutex);
Did you test this patch?
I'm sure you did not. You return before the protocol
is registered, this breaks IPsec for IPv4 completely.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-04-19 1:08 [PATCH] net: add mutex_unlock on xfrm4_protocol_register sunlianwen
2018-04-19 5:18 ` Steffen Klassert
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