!10471 ALSA: emux: improve patch ioctl data validation

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Yejian <zhengyejian1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/ZWGGDBJ5AH6ILMP4RMGUKGHDTC37L5DQ/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAGEP7 
 
Link:https://gitee.com/openeuler/kernel/pulls/10471

 

Reviewed-by: Ye Weihua <yeweihua4@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>