linux-kernel - Re: [v4l-dvb-maintainer] [2.6 patch] dvb_net

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Date:	Thu, 16 Aug 2007 11:20:21 +0400
From:	Manu Abraham <abraham.manu@...il.com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	v4l-dvb-maintainer@...uxtv.org, linux-kernel@...r.kernel.org
Subject: Re: [v4l-dvb-maintainer] [2.6 patch] dvb_net_ule(): fix check-after-use

Adrian Bunk wrote:
> The Coverity checker spotted that we'd have already oops'ed if "dev"
> was NULL.
> 
> Signed-off-by: Adrian Bunk <bunk@...nel.org>
> 
> ---
> --- linux-2.6.23-rc1-mm2/drivers/media/dvb/dvb-core/dvb_net.c.old	2007-08-08 06:17:19.000000000 +0200
> +++ linux-2.6.23-rc1-mm2/drivers/media/dvb/dvb-core/dvb_net.c	2007-08-08 06:17:35.000000000 +0200
> @@ -346,33 +346,28 @@
>  static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
>  {
>  	struct dvb_net_priv *priv = dev->priv;
>  	unsigned long skipped = 0L;
>  	const u8 *ts, *ts_end, *from_where = NULL;
>  	u8 ts_remain = 0, how_much = 0, new_ts = 1;
>  	struct ethhdr *ethh = NULL;
>  
>  #ifdef ULE_DEBUG
>  	/* The code inside ULE_DEBUG keeps a history of the last 100 TS cells processed. */
>  	static unsigned char ule_hist[100*TS_SZ];
>  	static unsigned char *ule_where = ule_hist, ule_dump = 0;
>  #endif
>  
> -	if (dev == NULL) {
> -		printk( KERN_ERR "NO netdev struct!\n" );
> -		return;
> -	}
> -
>  	/* For all TS cells in current buffer.
>  	 * Appearently, we are called for every single TS cell.
>  	 */
>  	for (ts = buf, ts_end = buf + buf_len; ts < ts_end; /* no default incr. */ ) {
>  
>  		if (new_ts) {
>  			/* We are about to process a new TS cell. */
>  
>  #ifdef ULE_DEBUG
>  			if (ule_where >= &ule_hist[100*TS_SZ]) ule_where = ule_hist;
>  			memcpy( ule_where, ts, TS_SZ );
>  			if (ule_dump) {
>  				hexdump( ule_where, TS_SZ );
>  				ule_dump = 0;
> 
> 

Signed-off-by: Manu Abraham <manu@...uxtv.org>
-
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