netdev - [PATCH net-next 2/5] rxrpc: Fix a missing NULL-pointer check in a trace

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Date:   Mon, 14 Sep 2020 16:31:00 +0100
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/5] rxrpc: Fix a missing NULL-pointer check in a
 trace

Fix the rxrpc_client tracepoint to not dereference conn to get the cid if
conn is NULL, as it does for other fields.

	RIP: 0010:trace_event_raw_event_rxrpc_client+0x7e/0xe0 [rxrpc]
	Call Trace:
	 rxrpc_activate_channels+0x62/0xb0 [rxrpc]
	 rxrpc_connect_call+0x481/0x650 [rxrpc]
	 ? wake_up_q+0xa0/0xa0
	 ? rxrpc_kernel_begin_call+0x12a/0x1b0 [rxrpc]
	 rxrpc_new_client_call+0x2a5/0x5e0 [rxrpc]

Fixes: 245500d853e9 ("rxrpc: Rewrite the client connection manager")
Reported-by: Marc Dionne <marc.dionne@...istor.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Tested-by: Marc Dionne <marc.dionne@...istor.com>
---

 include/trace/events/rxrpc.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 3b67d5981224..e70c90116eda 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -579,7 +579,7 @@ TRACE_EVENT(rxrpc_client,
 		    __entry->channel = channel;
 		    __entry->usage = conn ? atomic_read(&conn->usage) : -2;
 		    __entry->op = op;
-		    __entry->cid = conn->proto.cid;
+		    __entry->cid = conn ? conn->proto.cid : 0;
 			   ),
 
 	    TP_printk("C=%08x h=%2d %s i=%08x u=%d",