linux-kernel - Re: [PATCH for-next 13/20] IB/hns: Add check for some NULL pointer scenes

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Date:   Tue, 13 Sep 2016 09:59:37 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Salil Mehta <salil.mehta@...wei.com>
Cc:     dledford@...hat.com, xavier.huwei@...wei.com, oulijun@...wei.com,
        yisen.zhuang@...wei.com, xuwei5@...ilicon.com,
        mehta.salil.lnk@...il.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com,
        "Dongdong Huang(Donald)" <hdd.huang@...wei.com>
Subject: Re: [PATCH for-next 13/20] IB/hns: Add check for some NULL pointer
 scenes

On Fri, Sep 09, 2016 at 06:30:44PM +0800, Salil Mehta wrote:
> From: Lijun Ou <oulijun@...wei.com>
>
> Some pointers have not be checked when they are null,
> so we add check for them.
>
> Signed-off-by: Lijun Ou <oulijun@...wei.com>
> Signed-off-by: Dongdong Huang(Donald) <hdd.huang@...wei.com>
> Reviewed-by:  Wei Hu (Xavier) <xavier.huwei@...wei.com>
> Signed-off-by: Salil Mehta <salil.mehta@...wei.com>

I may admit that I didn't check your code to read the implementations of
get_send_wqe() and hns_roce_v1_poll_one(), but based on my assumption
that the code is similar to mlx4.

These failures can't occur.

Can you throw a light on how did you find them and check it?

> ---
>  drivers/infiniband/hw/hns/hns_roce_hw_v1.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> index f0d6315..e3e154c 100644
> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
> @@ -92,6 +92,12 @@ int hns_roce_v1_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
>  		}
>
>  		wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
> +		if (unlikely(!wqe)) {
> +			dev_err(dev, "get send wqe failed\n");
> +			ret = -EINVAL;
> +			*bad_wr = wr;
> +			goto out;
> +		}
>  		qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] =
>  								      wr->wr_id;
>
> @@ -1558,6 +1564,11 @@ static int hns_roce_v1_poll_one(struct hns_roce_cq *hr_cq,
>  		sq_wqe = get_send_wqe(*cur_qp, roce_get_field(cqe->cqe_byte_4,
>  						CQE_BYTE_4_WQE_INDEX_M,
>  						CQE_BYTE_4_WQE_INDEX_S));
> +		if (unlikely(!sq_wqe)) {
> +			dev_err(dev, "Get send wqe failed!\n");
> +			return -EFAULT;
> +		}
> +
>  		switch (sq_wqe->flag & HNS_ROCE_WQE_OPCODE_MASK) {
>  		case HNS_ROCE_WQE_OPCODE_SEND:
>  			wc->opcode = IB_WC_SEND;
> --
> 1.7.9.5
>
> --
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