linux-kernel - Re: [PATCH][next] RDMA/hns: Fix uninitialized variable bug

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Date:   Fri, 27 Mar 2020 21:28:31 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     liweihang <liweihang@...wei.com>, oulijun <oulijun@...wei.com>,
        "Huwei (Xavier)" <huwei87@...ilicon.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "wangxi (M)" <wangxi11@...wei.com>
Cc:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] RDMA/hns: Fix uninitialized variable bug



On 3/27/20 21:15, liweihang wrote:
> On 2020/3/28 3:28, Gustavo A. R. Silva wrote:
>> There is a potential execution path in which variable *ret* is returned
>> without being properly initialized, previously.
>>
>> Fix this by initializing variable *ret* to -ENODEV.
>>
>> Addresses-Coverity-ID: 1491917 ("Uninitialized scalar variable")
>> Fixes: 2f49de21f3e9 ("RDMA/hns: Optimize mhop get flow for multi-hop addressing")
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>>  drivers/infiniband/hw/hns/hns_roce_hem.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.c b/drivers/infiniband/hw/hns/hns_roce_hem.c
>> index c96378718f88..3fd8100c2b56 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_hem.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_hem.c
>> @@ -603,7 +603,7 @@ static int set_mhop_hem(struct hns_roce_dev *hr_dev,
>>  {
>>  	struct ib_device *ibdev = &hr_dev->ib_dev;
>>  	int step_idx;
>> -	int ret;
>> +	int ret = -ENODEV;
>>  
>>  	if (index->inited & HEM_INDEX_L0) {
>>  		ret = hr_dev->hw->set_hem(hr_dev, table, obj, 0);
>>
> 
> Hi Gustavo,
> 

Hi Weihang,

> Thanks for your modification. But I check the code and I think "ret"
> should be initialized to 0, which means no need to set hem and it is
> not an error.
> 

Oh, I see. Thanks for the feedback. I'll send v2 shortly.

Thanks
--
Gustavo