linux-kernel - Re: [RFC v1 1/4] nvmet-trace: avoid dereferencing pointer too early

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Message-ID: <20230905064846.GA19701@lst.de>
Date:   Tue, 5 Sep 2023 08:48:46 +0200
From:   Christoph Hellwig <hch@....de>
To:     Daniel Wagner <dwagner@...e.de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Hannes Reinecke <hare@...e.de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Jason Gunthorpe <jgg@...pe.ca>,
        James Smart <james.smart@...adcom.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC v1 1/4] nvmet-trace: avoid dereferencing pointer too early

> +static inline u16 nvmet_req_to_ctrl_id(struct nvmet_req *req)
>  {
> -	return req->sq->ctrl;
> +	if (!req->sq || !req->sq->ctrl)
> +		return 0;
> +	return req->sq->ctrl->cntlid;

Can you add a comment here why we have this check?