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

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Date:   Sat, 28 Mar 2020 02:15:14 +0000
From:   liweihang <liweihang@...wei.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.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 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,

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.

Weihang