linux-kernel - Re: [PATCH] RDMA/srp: Set scmnd->result only when scmnd is not NULL

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Date:   Wed, 31 Aug 2022 02:31:37 +0000
From:   "yangx.jy@...itsu.com" <yangx.jy@...itsu.com>
To:     "lizhijian@...itsu.com" <lizhijian@...itsu.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RDMA/srp: Set scmnd->result only when scmnd is not NULL

On 2022/8/31 9:59, Li Zhijian wrote:
> 
> What i can see is that we have other places to de-reference scmnd and
> 
> scmnd = srp_claim_req(ch, req, NULL, scmnd) is possible to return a NULL 
> to scmnd

Hi,

Thanks for your review.

Yes, it seems better to just check scmnd before setting scmnd->result, 
like this:
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c 
b/drivers/infiniband/ulp/srp/ib_srp.c
index 7720ea270ed8..99f5e7f852b3 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1972,7 +1972,9 @@ static void srp_process_rsp(struct srp_rdma_ch 
*ch, struct srp_rsp *rsp)

                         return;
                 }
-               scmnd->result = rsp->status;
+
+               if (scmnd)
+                       scmnd->result = rsp->status;

Best Regards,
Xiao Yang