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rtl8187: Use usb anchor facilities to manage urbs
When SLUB debugging is enabled in the kernel, and the boot command includes the option "slub_debug=P", rtl8187 encounters a GPF due to a read-after-free of a urb. Following the example of changes in p54usb to fix the same problem, the code has been modified to use the usb_anchor_urb() method. With this change, the USB core handles the freeing of urb's. This patch fixes the problem reported in Kernel Bugzilla #12185 (http://bugzilla.kernel.org/show_bug.cgi?id=12185). Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Tested-by: Hin-Tak Leung <htl10@users.sourceforge.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Larry Finger
John W. Linville
parent
388cdf31db
commit
c1db52b9d2
@ -99,6 +99,7 @@ struct rtl8187_priv {
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struct ieee80211_supported_band band;
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struct usb_device *udev;
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u32 rx_conf;
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struct usb_anchor anchored;
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u16 txpwr_base;
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u8 asic_rev;
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u8 is_rtl8187b;
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@ -115,7 +116,6 @@ struct rtl8187_priv {
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u8 aifsn[4];
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struct {
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__le64 buf;
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struct urb *urb;
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struct sk_buff_head queue;
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} b_tx_status;
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};
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@ -99,7 +99,6 @@ static const struct ieee80211_channel rtl818x_channels[] = {
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static void rtl8187_iowrite_async_cb(struct urb *urb)
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{
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kfree(urb->context);
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usb_free_urb(urb);
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}
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static void rtl8187_iowrite_async(struct rtl8187_priv *priv, __le16 addr,
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@ -136,11 +135,13 @@ static void rtl8187_iowrite_async(struct rtl8187_priv *priv, __le16 addr,
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usb_fill_control_urb(urb, priv->udev, usb_sndctrlpipe(priv->udev, 0),
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(unsigned char *)dr, buf, len,
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rtl8187_iowrite_async_cb, buf);
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usb_anchor_urb(urb, &priv->anchored);
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rc = usb_submit_urb(urb, GFP_ATOMIC);
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if (rc < 0) {
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kfree(buf);
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usb_free_urb(urb);
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usb_unanchor_urb(urb);
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}
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usb_free_urb(urb);
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}
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static inline void rtl818x_iowrite32_async(struct rtl8187_priv *priv,
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@ -172,7 +173,6 @@ static void rtl8187_tx_cb(struct urb *urb)
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struct ieee80211_hw *hw = info->rate_driver_data[0];
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struct rtl8187_priv *priv = hw->priv;
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usb_free_urb(info->rate_driver_data[1]);
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skb_pull(skb, priv->is_rtl8187b ? sizeof(struct rtl8187b_tx_hdr) :
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sizeof(struct rtl8187_tx_hdr));
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ieee80211_tx_info_clear_status(info);
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@ -273,11 +273,13 @@ static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
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usb_fill_bulk_urb(urb, priv->udev, usb_sndbulkpipe(priv->udev, ep),
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buf, skb->len, rtl8187_tx_cb, skb);
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usb_anchor_urb(urb, &priv->anchored);
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rc = usb_submit_urb(urb, GFP_ATOMIC);
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if (rc < 0) {
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usb_free_urb(urb);
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usb_unanchor_urb(urb);
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kfree_skb(skb);
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}
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usb_free_urb(urb);
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return 0;
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}
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@ -301,14 +303,13 @@ static void rtl8187_rx_cb(struct urb *urb)
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return;
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}
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spin_unlock(&priv->rx_queue.lock);
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skb_put(skb, urb->actual_length);
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if (unlikely(urb->status)) {
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usb_free_urb(urb);
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dev_kfree_skb_irq(skb);
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return;
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}
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skb_put(skb, urb->actual_length);
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if (!priv->is_rtl8187b) {
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struct rtl8187_rx_hdr *hdr =
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(typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
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@ -361,7 +362,6 @@ static void rtl8187_rx_cb(struct urb *urb)
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skb = dev_alloc_skb(RTL8187_MAX_RX);
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if (unlikely(!skb)) {
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usb_free_urb(urb);
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/* TODO check rx queue length and refill *somewhere* */
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return;
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}
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@ -373,24 +373,32 @@ static void rtl8187_rx_cb(struct urb *urb)
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urb->context = skb;
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skb_queue_tail(&priv->rx_queue, skb);
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usb_submit_urb(urb, GFP_ATOMIC);
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usb_anchor_urb(urb, &priv->anchored);
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if (usb_submit_urb(urb, GFP_ATOMIC)) {
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usb_unanchor_urb(urb);
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skb_unlink(skb, &priv->rx_queue);
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dev_kfree_skb_irq(skb);
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}
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}
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static int rtl8187_init_urbs(struct ieee80211_hw *dev)
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{
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struct rtl8187_priv *priv = dev->priv;
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struct urb *entry;
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struct urb *entry = NULL;
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struct sk_buff *skb;
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struct rtl8187_rx_info *info;
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int ret = 0;
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while (skb_queue_len(&priv->rx_queue) < 8) {
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skb = __dev_alloc_skb(RTL8187_MAX_RX, GFP_KERNEL);
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if (!skb)
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break;
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if (!skb) {
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ret = -ENOMEM;
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goto err;
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}
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entry = usb_alloc_urb(0, GFP_KERNEL);
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if (!entry) {
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kfree_skb(skb);
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break;
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ret = -ENOMEM;
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goto err;
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}
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usb_fill_bulk_urb(entry, priv->udev,
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usb_rcvbulkpipe(priv->udev,
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@ -401,10 +409,22 @@ static int rtl8187_init_urbs(struct ieee80211_hw *dev)
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info->urb = entry;
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info->dev = dev;
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skb_queue_tail(&priv->rx_queue, skb);
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usb_submit_urb(entry, GFP_KERNEL);
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usb_anchor_urb(entry, &priv->anchored);
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ret = usb_submit_urb(entry, GFP_KERNEL);
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if (ret) {
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skb_unlink(skb, &priv->rx_queue);
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usb_unanchor_urb(entry);
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goto err;
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}
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usb_free_urb(entry);
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}
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return ret;
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return 0;
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err:
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usb_free_urb(entry);
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kfree_skb(skb);
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usb_kill_anchored_urbs(&priv->anchored);
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return ret;
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}
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static void rtl8187b_status_cb(struct urb *urb)
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@ -414,10 +434,8 @@ static void rtl8187b_status_cb(struct urb *urb)
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u64 val;
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unsigned int cmd_type;
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if (unlikely(urb->status)) {
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usb_free_urb(urb);
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if (unlikely(urb->status))
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return;
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}
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/*
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* Read from status buffer:
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@ -488,26 +506,32 @@ static void rtl8187b_status_cb(struct urb *urb)
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spin_unlock_irqrestore(&priv->b_tx_status.queue.lock, flags);
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}
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usb_submit_urb(urb, GFP_ATOMIC);
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usb_anchor_urb(urb, &priv->anchored);
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if (usb_submit_urb(urb, GFP_ATOMIC))
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usb_unanchor_urb(urb);
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}
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static int rtl8187b_init_status_urb(struct ieee80211_hw *dev)
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{
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struct rtl8187_priv *priv = dev->priv;
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struct urb *entry;
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int ret = 0;
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entry = usb_alloc_urb(0, GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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priv->b_tx_status.urb = entry;
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usb_fill_bulk_urb(entry, priv->udev, usb_rcvbulkpipe(priv->udev, 9),
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&priv->b_tx_status.buf, sizeof(priv->b_tx_status.buf),
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rtl8187b_status_cb, dev);
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usb_submit_urb(entry, GFP_KERNEL);
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usb_anchor_urb(entry, &priv->anchored);
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ret = usb_submit_urb(entry, GFP_KERNEL);
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if (ret)
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usb_unanchor_urb(entry);
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usb_free_urb(entry);
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return 0;
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return ret;
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}
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static int rtl8187_cmd_reset(struct ieee80211_hw *dev)
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@ -841,6 +865,9 @@ static int rtl8187_start(struct ieee80211_hw *dev)
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return ret;
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mutex_lock(&priv->conf_mutex);
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init_usb_anchor(&priv->anchored);
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if (priv->is_rtl8187b) {
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reg = RTL818X_RX_CONF_MGMT |
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RTL818X_RX_CONF_DATA |
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@ -936,12 +963,12 @@ static void rtl8187_stop(struct ieee80211_hw *dev)
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while ((skb = skb_dequeue(&priv->rx_queue))) {
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info = (struct rtl8187_rx_info *)skb->cb;
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usb_kill_urb(info->urb);
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kfree_skb(skb);
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}
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while ((skb = skb_dequeue(&priv->b_tx_status.queue)))
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dev_kfree_skb_any(skb);
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usb_kill_urb(priv->b_tx_status.urb);
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usb_kill_anchored_urbs(&priv->anchored);
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mutex_unlock(&priv->conf_mutex);
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}
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