linux-kernel - Re: [RFC PATCH v1 01/10] net: qrtr: ns: validate msglen before ctrl

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Message-ID: <82f296f8-9538-4c89-952f-ff8768c5a0b7@quicinc.com>
Date: Mon, 21 Oct 2024 21:27:55 -0700
From: Chris Lew <quic_clew@...cinc.com>
To: Denis Kenzior <denkenz@...il.com>, <netdev@...r.kernel.org>
CC: Marcel Holtmann <marcel@...tmann.org>, Andy Gross <agross@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "David S. Miller"
	<davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v1 01/10] net: qrtr: ns: validate msglen before
 ctrl_pkt use



On 10/18/2024 11:18 AM, Denis Kenzior wrote:
> The qrtr_ctrl_pkt structure is currently accessed without checking
> if the received payload is large enough to hold the structure's fields.
> Add a check to ensure the payload length is sufficient.
> 
> Signed-off-by: Denis Kenzior <denkenz@...il.com>
> Reviewed-by: Marcel Holtmann <marcel@...tmann.org>
> Reviewed-by: Andy Gross <agross@...nel.org>
> ---
>   net/qrtr/ns.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
> index 3de9350cbf30..6158e08c0252 100644
> --- a/net/qrtr/ns.c
> +++ b/net/qrtr/ns.c
> @@ -619,6 +619,9 @@ static void qrtr_ns_worker(struct work_struct *work)
>   			break;
>   		}
>   
> +		if ((size_t)msglen < sizeof(pkt))

sizeof(*pkt)?

> +			break;
> +
>   		pkt = recv_buf;
>   		cmd = le32_to_cpu(pkt->cmd);
>   		if (cmd < ARRAY_SIZE(qrtr_ctrl_pkt_strings) &&