p54usb: rewriting rx/tx routines to make use of usb_anchor's facilities
Alan Stern found several flaws in p54usb's implementation and annotated: "usb_kill_urb() and similar routines do not expect an URB's completion routine to deallocate it. This is almost obvious -- if the URB is deallocated before the completion routine returns then there's no way for usb_kill_urb to detect when the URB actually is complete." This patch addresses all known limitations in the old implementation and fixes khub's "use-after-freed" hang, when SLUB debug's poisoning option is enabled. Signed-off-by: Christian Lamparter <chunkeey@web.de> Cc: stable@kernel.org Tested-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
parent
a07d3619fa
commit
dd397dc9dd
|
@ -86,13 +86,13 @@ static void p54u_rx_cb(struct urb *urb)
|
|||
struct ieee80211_hw *dev = info->dev;
|
||||
struct p54u_priv *priv = dev->priv;
|
||||
|
||||
skb_unlink(skb, &priv->rx_queue);
|
||||
|
||||
if (unlikely(urb->status)) {
|
||||
info->urb = NULL;
|
||||
usb_free_urb(urb);
|
||||
dev_kfree_skb_irq(skb);
|
||||
return;
|
||||
}
|
||||
|
||||
skb_unlink(skb, &priv->rx_queue);
|
||||
skb_put(skb, urb->actual_length);
|
||||
|
||||
if (priv->hw_type == P54U_NET2280)
|
||||
|
@ -105,7 +105,6 @@ static void p54u_rx_cb(struct urb *urb)
|
|||
if (p54_rx(dev, skb)) {
|
||||
skb = dev_alloc_skb(priv->common.rx_mtu + 32);
|
||||
if (unlikely(!skb)) {
|
||||
usb_free_urb(urb);
|
||||
/* TODO check rx queue length and refill *somewhere* */
|
||||
return;
|
||||
}
|
||||
|
@ -115,7 +114,6 @@ static void p54u_rx_cb(struct urb *urb)
|
|||
info->dev = dev;
|
||||
urb->transfer_buffer = skb_tail_pointer(skb);
|
||||
urb->context = skb;
|
||||
skb_queue_tail(&priv->rx_queue, skb);
|
||||
} else {
|
||||
if (priv->hw_type == P54U_NET2280)
|
||||
skb_push(skb, priv->common.tx_hdr_len);
|
||||
|
@ -130,11 +128,14 @@ static void p54u_rx_cb(struct urb *urb)
|
|||
WARN_ON(1);
|
||||
urb->transfer_buffer = skb_tail_pointer(skb);
|
||||
}
|
||||
|
||||
skb_queue_tail(&priv->rx_queue, skb);
|
||||
}
|
||||
|
||||
usb_submit_urb(urb, GFP_ATOMIC);
|
||||
skb_queue_tail(&priv->rx_queue, skb);
|
||||
usb_anchor_urb(urb, &priv->submitted);
|
||||
if (usb_submit_urb(urb, GFP_ATOMIC)) {
|
||||
skb_unlink(skb, &priv->rx_queue);
|
||||
usb_unanchor_urb(urb);
|
||||
dev_kfree_skb_irq(skb);
|
||||
}
|
||||
}
|
||||
|
||||
static void p54u_tx_reuse_skb_cb(struct urb *urb)
|
||||
|
@ -144,18 +145,6 @@ static void p54u_tx_reuse_skb_cb(struct urb *urb)
|
|||
usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0)))->priv;
|
||||
|
||||
skb_pull(skb, priv->common.tx_hdr_len);
|
||||
usb_free_urb(urb);
|
||||
}
|
||||
|
||||
static void p54u_tx_cb(struct urb *urb)
|
||||
{
|
||||
usb_free_urb(urb);
|
||||
}
|
||||
|
||||
static void p54u_tx_free_cb(struct urb *urb)
|
||||
{
|
||||
kfree(urb->transfer_buffer);
|
||||
usb_free_urb(urb);
|
||||
}
|
||||
|
||||
static void p54u_tx_free_skb_cb(struct urb *urb)
|
||||
|
@ -165,25 +154,36 @@ static void p54u_tx_free_skb_cb(struct urb *urb)
|
|||
usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
|
||||
|
||||
p54_free_skb(dev, skb);
|
||||
usb_free_urb(urb);
|
||||
}
|
||||
|
||||
static void p54u_tx_dummy_cb(struct urb *urb) { }
|
||||
|
||||
static void p54u_free_urbs(struct ieee80211_hw *dev)
|
||||
{
|
||||
struct p54u_priv *priv = dev->priv;
|
||||
usb_kill_anchored_urbs(&priv->submitted);
|
||||
}
|
||||
|
||||
static int p54u_init_urbs(struct ieee80211_hw *dev)
|
||||
{
|
||||
struct p54u_priv *priv = dev->priv;
|
||||
struct urb *entry;
|
||||
struct urb *entry = NULL;
|
||||
struct sk_buff *skb;
|
||||
struct p54u_rx_info *info;
|
||||
int ret = 0;
|
||||
|
||||
while (skb_queue_len(&priv->rx_queue) < 32) {
|
||||
skb = __dev_alloc_skb(priv->common.rx_mtu + 32, GFP_KERNEL);
|
||||
if (!skb)
|
||||
break;
|
||||
if (!skb) {
|
||||
ret = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
entry = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!entry) {
|
||||
kfree_skb(skb);
|
||||
break;
|
||||
ret = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
|
||||
usb_fill_bulk_urb(entry, priv->udev,
|
||||
usb_rcvbulkpipe(priv->udev, P54U_PIPE_DATA),
|
||||
skb_tail_pointer(skb),
|
||||
|
@ -192,26 +192,25 @@ static int p54u_init_urbs(struct ieee80211_hw *dev)
|
|||
info->urb = entry;
|
||||
info->dev = dev;
|
||||
skb_queue_tail(&priv->rx_queue, skb);
|
||||
usb_submit_urb(entry, GFP_KERNEL);
|
||||
|
||||
usb_anchor_urb(entry, &priv->submitted);
|
||||
ret = usb_submit_urb(entry, GFP_KERNEL);
|
||||
if (ret) {
|
||||
skb_unlink(skb, &priv->rx_queue);
|
||||
usb_unanchor_urb(entry);
|
||||
goto err;
|
||||
}
|
||||
usb_free_urb(entry);
|
||||
entry = NULL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void p54u_free_urbs(struct ieee80211_hw *dev)
|
||||
{
|
||||
struct p54u_priv *priv = dev->priv;
|
||||
struct p54u_rx_info *info;
|
||||
struct sk_buff *skb;
|
||||
|
||||
while ((skb = skb_dequeue(&priv->rx_queue))) {
|
||||
info = (struct p54u_rx_info *) skb->cb;
|
||||
if (!info->urb)
|
||||
continue;
|
||||
|
||||
usb_kill_urb(info->urb);
|
||||
kfree_skb(skb);
|
||||
}
|
||||
err:
|
||||
usb_free_urb(entry);
|
||||
kfree_skb(skb);
|
||||
p54u_free_urbs(dev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void p54u_tx_3887(struct ieee80211_hw *dev, struct sk_buff *skb,
|
||||
|
@ -219,6 +218,7 @@ static void p54u_tx_3887(struct ieee80211_hw *dev, struct sk_buff *skb,
|
|||
{
|
||||
struct p54u_priv *priv = dev->priv;
|
||||
struct urb *addr_urb, *data_urb;
|
||||
int err = 0;
|
||||
|
||||
addr_urb = usb_alloc_urb(0, GFP_ATOMIC);
|
||||
if (!addr_urb)
|
||||
|
@ -233,15 +233,31 @@ static void p54u_tx_3887(struct ieee80211_hw *dev, struct sk_buff *skb,
|
|||
usb_fill_bulk_urb(addr_urb, priv->udev,
|
||||
usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
|
||||
&((struct p54_hdr *)skb->data)->req_id, 4,
|
||||
p54u_tx_cb, dev);
|
||||
p54u_tx_dummy_cb, dev);
|
||||
usb_fill_bulk_urb(data_urb, priv->udev,
|
||||
usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
|
||||
skb->data, skb->len,
|
||||
free_on_tx ? p54u_tx_free_skb_cb :
|
||||
p54u_tx_reuse_skb_cb, skb);
|
||||
|
||||
usb_submit_urb(addr_urb, GFP_ATOMIC);
|
||||
usb_submit_urb(data_urb, GFP_ATOMIC);
|
||||
usb_anchor_urb(addr_urb, &priv->submitted);
|
||||
err = usb_submit_urb(addr_urb, GFP_ATOMIC);
|
||||
if (err) {
|
||||
usb_unanchor_urb(addr_urb);
|
||||
goto out;
|
||||
}
|
||||
|
||||
usb_anchor_urb(addr_urb, &priv->submitted);
|
||||
err = usb_submit_urb(data_urb, GFP_ATOMIC);
|
||||
if (err)
|
||||
usb_unanchor_urb(data_urb);
|
||||
|
||||
out:
|
||||
usb_free_urb(addr_urb);
|
||||
usb_free_urb(data_urb);
|
||||
|
||||
if (err)
|
||||
p54_free_skb(dev, skb);
|
||||
}
|
||||
|
||||
static __le32 p54u_lm87_chksum(const __le32 *data, size_t length)
|
||||
|
@ -281,7 +297,13 @@ static void p54u_tx_lm87(struct ieee80211_hw *dev, struct sk_buff *skb,
|
|||
free_on_tx ? p54u_tx_free_skb_cb :
|
||||
p54u_tx_reuse_skb_cb, skb);
|
||||
|
||||
usb_submit_urb(data_urb, GFP_ATOMIC);
|
||||
usb_anchor_urb(data_urb, &priv->submitted);
|
||||
if (usb_submit_urb(data_urb, GFP_ATOMIC)) {
|
||||
usb_unanchor_urb(data_urb);
|
||||
skb_pull(skb, sizeof(*hdr));
|
||||
p54_free_skb(dev, skb);
|
||||
}
|
||||
usb_free_urb(data_urb);
|
||||
}
|
||||
|
||||
static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb,
|
||||
|
@ -291,6 +313,7 @@ static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb,
|
|||
struct urb *int_urb, *data_urb;
|
||||
struct net2280_tx_hdr *hdr;
|
||||
struct net2280_reg_write *reg;
|
||||
int err = 0;
|
||||
|
||||
reg = kmalloc(sizeof(*reg), GFP_ATOMIC);
|
||||
if (!reg)
|
||||
|
@ -320,15 +343,42 @@ static void p54u_tx_net2280(struct ieee80211_hw *dev, struct sk_buff *skb,
|
|||
|
||||
usb_fill_bulk_urb(int_urb, priv->udev,
|
||||
usb_sndbulkpipe(priv->udev, P54U_PIPE_DEV), reg, sizeof(*reg),
|
||||
p54u_tx_free_cb, dev);
|
||||
usb_submit_urb(int_urb, GFP_ATOMIC);
|
||||
p54u_tx_dummy_cb, dev);
|
||||
|
||||
/*
|
||||
* This flag triggers a code path in the USB subsystem that will
|
||||
* free what's inside the transfer_buffer after the callback routine
|
||||
* has completed.
|
||||
*/
|
||||
int_urb->transfer_flags |= URB_FREE_BUFFER;
|
||||
|
||||
usb_fill_bulk_urb(data_urb, priv->udev,
|
||||
usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
|
||||
skb->data, skb->len,
|
||||
free_on_tx ? p54u_tx_free_skb_cb :
|
||||
p54u_tx_reuse_skb_cb, skb);
|
||||
usb_submit_urb(data_urb, GFP_ATOMIC);
|
||||
|
||||
usb_anchor_urb(int_urb, &priv->submitted);
|
||||
err = usb_submit_urb(int_urb, GFP_ATOMIC);
|
||||
if (err) {
|
||||
usb_unanchor_urb(int_urb);
|
||||
goto out;
|
||||
}
|
||||
|
||||
usb_anchor_urb(data_urb, &priv->submitted);
|
||||
err = usb_submit_urb(data_urb, GFP_ATOMIC);
|
||||
if (err) {
|
||||
usb_unanchor_urb(data_urb);
|
||||
goto out;
|
||||
}
|
||||
out:
|
||||
usb_free_urb(int_urb);
|
||||
usb_free_urb(data_urb);
|
||||
|
||||
if (err) {
|
||||
skb_pull(skb, sizeof(*hdr));
|
||||
p54_free_skb(dev, skb);
|
||||
}
|
||||
}
|
||||
|
||||
static int p54u_write(struct p54u_priv *priv,
|
||||
|
@ -885,6 +935,7 @@ static int __devinit p54u_probe(struct usb_interface *intf,
|
|||
goto err_free_dev;
|
||||
|
||||
skb_queue_head_init(&priv->rx_queue);
|
||||
init_usb_anchor(&priv->submitted);
|
||||
|
||||
p54u_open(dev);
|
||||
err = p54_read_eeprom(dev);
|
||||
|
|
|
@ -133,6 +133,7 @@ struct p54u_priv {
|
|||
|
||||
spinlock_t lock;
|
||||
struct sk_buff_head rx_queue;
|
||||
struct usb_anchor submitted;
|
||||
};
|
||||
|
||||
#endif /* P54USB_H */
|
||||
|
|
Loading…
Reference in New Issue