[PATCH net-next] tipc: discard MSG_CRYPTO msgs when key_exchange_enabled is not set

When key_exchange is disabled, there is no reason to accept MSG_CRYPTO
msgs if it doesn't send MSG_CRYPTO msgs.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
---
 net/tipc/link.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/tipc/link.c b/net/tipc/link.c
index 09ae8448f394..8d9e09f48f4c 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c

@@ -1298,7 +1298,8 @@ static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb,
 		return false;
 #ifdef CONFIG_TIPC_CRYPTO
 	case MSG_CRYPTO:
-		if (TIPC_SKB_CB(skb)->decrypted) {
+		if (sysctl_tipc_key_exchange_enabled &&
+		    TIPC_SKB_CB(skb)->decrypted) {
 			tipc_crypto_msg_rcv(l->net, skb);
 			return true;
 		}

-- 
2.27.0

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller [off-list ref]:

On Fri, 10 Dec 2021 13:50:40 -0500 you wrote:

When key_exchange is disabled, there is no reason to accept MSG_CRYPTO
msgs if it doesn't send MSG_CRYPTO msgs.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Jon Maloy <jmaloy@redhat.com>
---
 net/tipc/link.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Here is the summary with links:
  - [net-next] tipc: discard MSG_CRYPTO msgs when key_exchange_enabled is not set
    https://git.kernel.org/netdev/net-next/c/6180c780e64c

You are awesome, thank you!
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