linux-kernel - Re: [PATCH] nfc: s3fwrn5: replace the assertion with a WARN

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Date:   Mon, 16 Dec 2019 16:42:55 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     pakki001@....edu
Cc:     kjlu@....edu, r.baldyga@...sung.com, k.opasiak@...sung.com,
        linux-nfc@...ts.01.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nfc: s3fwrn5: replace the assertion with a WARN_ON

From: Aditya Pakki <pakki001@....edu>
Date: Sun, 15 Dec 2019 13:01:29 -0600

> @@ -507,7 +507,8 @@ int s3fwrn5_fw_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
>  	struct s3fwrn5_info *info = nci_get_drvdata(ndev);
>  	struct s3fwrn5_fw_info *fw_info = &info->fw_info;
>  
> -	BUG_ON(fw_info->rsp);
> +	if (WARN_ON(fw_info->rsp))
> +		return -EINVAL;
>  
>  	fw_info->rsp = skb;

This leaks "skb" and you can even see that this might be the case
purely by looking at the context of the patch.