linux-kernel - Re: [PATCHv2] staging: Check against NULL in fw_download

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Message-ID: <20140811214824.GA19333@cantor.redhat.com>
Date:	Mon, 11 Aug 2014 14:48:24 -0700
From:	Jerry Snitselaar <dev@...tselaar.org>
To:	Nicholas Krause <xerofoify@...il.com>
Cc:	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	ben@...adent.org.uk, lisa@...apiadmin.com,
	valentina.manea.m@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] staging: Check against NULL in fw_download_code

On Mon Aug 11 14, Nicholas Krause wrote:
> I am fixing the bug entry , https://bugzilla.kernel.org/show_bug.cgi?id=60461.
> This entry states that we are not checking the skb allocated in fw_download_code
> and after checking I fixed it to check for the NULL value before using the allocate
> skb.
> 
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
>  drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c b/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
> index 1a95d1f..817e50e 100644
> --- a/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
> +++ b/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
> @@ -61,6 +61,8 @@ static bool fw_download_code(struct net_device *dev, u8 *code_virtual_address,
>  		}
>  
>  		skb  = dev_alloc_skb(frag_length + 4);
> +		if (skb == NULL)
> +			return !rt_status;
>  		memcpy((unsigned char *)(skb->cb), &dev, sizeof(dev));
>  		tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
>  		tcb_desc->queue_index = TXCMD_QUEUE;
> -- 
> 1.9.1


Look at fw_download_code() in drivers/staging/rtl8192u/r819xU_firmware.c
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