SUNRPC: Fix oops in the rpc_xdr_buf event class

[ Upstream commit c3213d260a23e263ef85ba21ac68c9e7578020b5 ]

Backchannel rpc tasks don't have task->tk_client set, so it's necessary
to check it for NULL before dereferencing.

Fixes: c509f15a5801 ("SUNRPC: Split the xdr_buf event class")
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index ca2f27b9f919da02715c9de03a73e9d8c46ddfdc..1652cc32aebcd26dd5271c808f52879b9df6c805 100644 (file)
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -68,7 +68,8 @@ DECLARE_EVENT_CLASS(rpc_xdr_buf_class,
 
        TP_fast_assign(
                __entry->task_id = task->tk_pid;
-               __entry->client_id = task->tk_client->cl_clid;
+               __entry->client_id = task->tk_client ?
+                                    task->tk_client->cl_clid : -1;
                __entry->head_base = xdr->head[0].iov_base;
                __entry->head_len = xdr->head[0].iov_len;
                __entry->tail_base = xdr->tail[0].iov_base;