SUNRPC: task should be exit if encode return EKEYEXPIRED more times

euler inclusion
category: bugfix
bugzilla: 14217
CVE: NA

-------------------------------------------------

If the rpc.gssd always return cred success, but now the cred is
expired(dected when encode the task), then the task will loop in
call_refresh and call_transmit.

Exit the rpc task after retry.

Link: https://patchwork.kernel.org/patch/10921577/Signed-off-by: NZhangXiaoxu <zhangxiaoxu5@huawei.com>
Reviewed-by: NHou Tao <houtao1@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

net/sunrpc/clnt.c

@@ -1962,8 +1962,11 @@ call_transmit(struct rpc_task *task)
 			/* Was the error nonfatal? */
 			if (task->tk_status == -EAGAIN)
 				rpc_delay(task, HZ >> 4);
-			else if (task->tk_status == -EKEYEXPIRED)
+			else if (task->tk_status == -EKEYEXPIRED &&
+				 task->tk_cred_retry) {
+				task->tk_cred_retry--;
 				task->tk_action = call_refresh;
+			}
 			else
 				rpc_exit(task, task->tk_status);
 			return;