linux-kernel - Re: [PATCH] staging: rtl8192e: check return value of dev_skb

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Date:	Wed, 18 Jun 2014 21:14:30 -0700
From:	Joe Perches <joe@...ches.com>
To:	Nicholas Krause <xerofoify@...il.com>
Cc:	gregkh@...uxfoundation.org, lisa@...apiadmin.com,
	valentina.manea.m@...il.com, ben@...adent.org.uk,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8192e: check return value of dev_skb_alloc

On Wed, 2014-06-18 at 22:24 -0400, Nicholas Krause wrote:
> Checks if dev_skb_alloc returns Null in function, fw_download_code.
> If the return value of dev_skb_alloc is NULL return false and exit
> this function.

Hello Nicholas.

If you're going to try add these checks, please look at
the code a bit more before submitting defective patches.

> diff --git a/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c b/drivers/staging/rtl8192e/rtl8192e/r8192E_firmware.c
[]
> @@ -62,6 +62,8 @@ static bool fw_download_code(struct net_device *dev, u8 *code_virtual_address,
>  
>  		skb  = dev_alloc_skb(frag_length + 4);
>  		memcpy((unsigned char *)(skb->cb), &dev, sizeof(dev));
> +		if (!skb)
> +			return !rt_status;

Umm, if you're going to check whether or not skb is NULL,
do it before it's dereferenced  as skb->cb.

Oh, and get rid of rt_status and use

			return false;

directly.

>  		tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
>  		tcb_desc->queue_index = TXCMD_QUEUE;
>  		tcb_desc->bCmdOrInit = DESC_PACKET_TYPE_INIT;

and change the end of function

from:
	return rt_status;
to:
	return true;

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