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Date:	Tue, 23 Oct 2007 13:00:34 -0700
From:	David Brownell <david-b@...bell.net>
To:	vbarshak@...mvista.com, linux-usb-devel@...ts.sourceforge.net
Cc:	dhollis@...ehollis.com, netdev@...r.kernel.org
Subject: Re: [linux-usb-devel] [PATCH] USB: net: Fix asix read transfer buffer allocations.

> From linux-usb-devel-bounces@...ts.sourceforge.net  Tue Oct 23 10:51:00 2007
> Date: Tue, 23 Oct 2007 21:40:18 +0400
> From: Valentine Barshak <vbarshak@...mvista.com>
> To: linux-usb-devel@...ts.sourceforge.net
> Cc: netdev@...r.kernel.org
> Subject: [linux-usb-devel] [PATCH] USB: net: Fix asix read transfer buffer
> 	allocations.
>
> On systems with noncoherent cache, allocating dma buffers
> on the stack for USB IN transfers causes kernel crash,
> because usb map_urb_for_dma() code calls dma_map_single(),
> that invalidates data cache for DMA_FROM_DEVICE transfer direction
> and causes stack data loss if transfer size is less than cache line
> and not cache-line aligned. This patch makes asix usb network
> driver allocate USB IN transfer buffers with kmalloc instead of
> directly using variables on stack. It also sets data parameter to NULL
> for zero-length transfers and uses ETH_ALEN size for allocating MAC 
> address buffer.

Looks plausible to me, on a quick scan, but you should CC Dave Hollis
for updates to this drver ... last I knew, he was still maintaining
this code.  (Though he's not listed in MAINTAINERS...)

This is missing a Signed-Off-By line ...


> diff -pruN linux-2.6.orig/drivers/net/usb/asix.c linux-2.6/drivers/net/usb/asix.c
> --- linux-2.6.orig/drivers/net/usb/asix.c	2007-10-23 20:52:11.000000000 +0400
> +++ linux-2.6/drivers/net/usb/asix.c	2007-10-23 20:57:38.000000000 +0400
> @@ -568,15 +568,23 @@ static void asix_set_multicast(struct ne
>  static int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
>  {
>  	struct usbnet *dev = netdev_priv(netdev);
> +	void *buf;
>  	u16 res;
>  
> +	buf = kmalloc(2, GFP_KERNEL);
> +	if (!buf)
> +		return -ENOMEM;
> +
>  	mutex_lock(&dev->phy_mutex);
>  	asix_set_sw_mii(dev);
>  	asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
> -				(__u16)loc, 2, (u16 *)&res);
> +				(__u16)loc, 2, buf);
>  	asix_set_hw_mii(dev);
>  	mutex_unlock(&dev->phy_mutex);
>  
> +	res = *((u16 *)buf);
> +	kfree(buf);
> +
>  	devdbg(dev, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x", phy_id, loc, le16_to_cpu(res & 0xffff));
>  
>  	return le16_to_cpu(res & 0xffff);
> @@ -622,13 +630,22 @@ static void
>  asix_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
>  {
>  	struct usbnet *dev = netdev_priv(net);
> +	void *buf;
>  	u8 opt;
>  
> -	if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
> +	buf = kmalloc(1, GFP_KERNEL);
> +	if (!buf)
> +		return;
> +
> +	if (asix_read_cmd(dev, AX_CMD_READ_MONITOR_MODE, 0, 0, 1, buf) < 0) {
>  		wolinfo->supported = 0;
>  		wolinfo->wolopts = 0;
> +		kfree(buf);
>  		return;
>  	}
> +	opt = *((u8 *)buf);
> +	kfree(buf);
> +
>  	wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
>  	wolinfo->wolopts = 0;
>  	if (opt & AX_MONITOR_MODE) {
> @@ -644,7 +661,6 @@ asix_set_wol(struct net_device *net, str
>  {
>  	struct usbnet *dev = netdev_priv(net);
>  	u8 opt = 0;
> -	u8 buf[1];
>  
>  	if (wolinfo->wolopts & WAKE_PHY)
>  		opt |= AX_MONITOR_LINK;
> @@ -654,7 +670,7 @@ asix_set_wol(struct net_device *net, str
>  		opt |= AX_MONITOR_MODE;
>  
>  	if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
> -			      opt, 0, 0, &buf) < 0)
> +			      opt, 0, 0, NULL) < 0)
>  		return -EINVAL;
>  
>  	return 0;
> @@ -820,7 +836,7 @@ static int ax88172_bind(struct usbnet *d
>  	for (i = 2; i >= 0; i--) {
>  		if ((ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS,
>  					(gpio_bits >> (i * 8)) & 0xff, 0, 0,
> -					buf)) < 0)
> +					NULL)) < 0)
>  			goto out2;
>  		msleep(5);
>  	}
> @@ -831,7 +847,7 @@ static int ax88172_bind(struct usbnet *d
>  	/* Get the MAC address */
>  	memset(buf, 0, ETH_ALEN);
>  	if ((ret = asix_read_cmd(dev, AX88172_CMD_READ_NODE_ID,
> -				0, 0, 6, buf)) < 0) {
> +				0, 0, ETH_ALEN, buf)) < 0) {
>  		dbg("read AX_CMD_READ_NODE_ID failed: %d", ret);
>  		goto out2;
>  	}
> @@ -909,7 +925,7 @@ static int ax88772_bind(struct usbnet *d
>  
>  	usbnet_get_endpoints(dev,intf);
>  
> -	buf = kmalloc(6, GFP_KERNEL);
> +	buf = kmalloc(ETH_ALEN, GFP_KERNEL);
>  	if(!buf) {
>  		dbg ("Cannot allocate memory for buffer");
>  		ret = -ENOMEM;
> @@ -923,7 +939,7 @@ static int ax88772_bind(struct usbnet *d
>  	/* 0x10 is the phy id of the embedded 10/100 ethernet phy */
>  	embd_phy = ((asix_get_phy_addr(dev) & 0x1f) == 0x10 ? 1 : 0);
>  	if ((ret = asix_write_cmd(dev, AX_CMD_SW_PHY_SELECT,
> -				embd_phy, 0, 0, buf)) < 0) {
> +				embd_phy, 0, 0, NULL)) < 0) {
>  		dbg("Select PHY #1 failed: %d", ret);
>  		goto out2;
>  	}
> @@ -998,7 +1014,7 @@ static int ax88772_bind(struct usbnet *d
>  
>  	if ((ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
>  				AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
> -				AX88772_IPG2_DEFAULT, 0, buf)) < 0) {
> +				AX88772_IPG2_DEFAULT, 0, NULL)) < 0) {
>  		dbg("Write IPG,IPG1,IPG2 failed: %d", ret);
>  		goto out2;
>  	}
> @@ -1202,20 +1218,22 @@ static int ax88178_bind(struct usbnet *d
>  
>  	usbnet_get_endpoints(dev,intf);
>  
> -	buf = kmalloc(6, GFP_KERNEL);
> +	buf = kmalloc(ETH_ALEN, GFP_KERNEL);
>  	if(!buf) {
>  		dbg ("Cannot allocate memory for buffer");
>  		ret = -ENOMEM;
>  		goto out1;
>  	}
>  
> -	eeprom = 0;
> -	asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, &eeprom);
> +	memset(buf, 0, ETH_ALEN);
> +	asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, buf);
> +	eeprom = *(u8 *)buf;
>  	dbg("GPIO Status: 0x%04x", eeprom);
>  
>  	asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0, 0, 0, NULL);
> -	asix_read_cmd(dev, AX_CMD_READ_EEPROM, 0x0017, 0, 2, &eeprom);
> +	asix_read_cmd(dev, AX_CMD_READ_EEPROM, 0x0017, 0, 2, buf);
>  	asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0, 0, 0, NULL);
> +	eeprom = *(u16 *)buf;
>  
>  	dbg("EEPROM index 0x17 is 0x%04x", eeprom);
>  
>
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