netdev - Potential uninitialized variables in subsys net: hisilicon

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Date:   Thu, 3 Oct 2019 20:35:38 -0700
From:   Yizhuo Zhai <yzhai003@....edu>
To:     Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Zhiyun Qian <zhiyunq@...ucr.edu>,
        Chengyu Song <csong@...ucr.edu>
Subject: Potential uninitialized variables in subsys net: hisilicon

Hi All:

drivers/net/ethernet/hisilicon/hip04_eth.c:

In function hip04_reset_ppe(), variable "val" could be uninitialized
if regmap_read() returns -EINVAL. However, "val" is used to decide
the control flow, which is potentially unsafe.

Also, we cannot simply return -EINVAL in hip04_reset_ppe() because
the return type is void.

Thanks for your time to check this case.

-- 
Kind Regards,

Yizhuo Zhai

Computer Science, Graduate Student
University of California, Riverside