linux-kernel - Re: [PATCH 2/3] net: qrtr: Add MHI transport layer

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Date:   Wed, 1 Apr 2020 00:10:23 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     gregkh@...uxfoundation.org, davem@...emloft.net,
        smohanad@...eaurora.org, jhugo@...eaurora.org,
        kvalo@...eaurora.org, hemantk@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] net: qrtr: Add MHI transport layer

On Tue 31 Mar 23:44 PDT 2020, Manivannan Sadhasivam wrote:
> diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
[..]
> +static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev,
> +				      struct mhi_result *mhi_res)
> +{
> +	struct sk_buff *skb = (struct sk_buff *)mhi_res->buf_addr;
> +
> +	consume_skb(skb);
> +	if (skb->sk)
> +		sock_put(skb->sk);

Don't you need to do this in opposite order, to avoid a use after free?

Regards,
Bjorn