linux-kernel - Re: [PATCH] nvme-tcp: fix signedness bug in nvme_tcp_init

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Message-ID: <20250305142554.GA18330@lst.de>
Date: Wed, 5 Mar 2025 15:25:54 +0100
From: Christoph Hellwig <hch@....de>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Caleb Sander Mateos <csander@...estorage.com>,
	Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
	Hannes Reinecke <hare@...e.de>, linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] nvme-tcp: fix signedness bug in
 nvme_tcp_init_connection()

On Fri, Feb 28, 2025 at 12:39:41PM +0300, Dan Carpenter wrote:
> index 8a9131c95a3d..361b04ec5b5d 100644
> --- a/drivers/nvme/host/tcp.c
> +++ b/drivers/nvme/host/tcp.c
> @@ -1495,7 +1495,7 @@ static int nvme_tcp_init_connection(struct nvme_tcp_queue *queue)
>  	msg.msg_flags = MSG_WAITALL;
>  	ret = kernel_recvmsg(queue->sock, &msg, &iov, 1,
>  			iov.iov_len, msg.msg_flags);
> -	if (ret < sizeof(*icresp)) {
> +	if (ret < (int)sizeof(*icresp)) {
>  		pr_warn("queue %d: failed to receive icresp, error %d\n",
>  			nvme_tcp_queue_id(queue), ret);
>  		if (ret >= 0)

I hate these magic casts.  What about something like:

	if (ret >= 0 && ret < sizeof(*icresp))
		ret = -ECONNRESET;
	if (ret < 0) {
		...