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Message-Id: <20200911071427.32354-1-brookebasile@gmail.com>
Date: Fri, 11 Sep 2020 03:14:27 -0400
From: Brooke Basile <brookebasile@...il.com>
To: kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org
Cc: gregkh@...uxfoundation.org, linux-wireless@...r.kernel.org,
linux-kernel@...r.kernel.org, ath9k-devel@....qualcomm.com,
syzkaller-bugs@...glegroups.com,
Brooke Basile <brookebasile@...il.com>,
syzbot+89bd486af9427a9fc605@...kaller.appspotmail.com
Subject: [PATCH] wireless: ath9k: hif_usb: fix race condition between usb_get_urb() and usb_kill_anchored_urbs()
Calls to usb_kill_anchored_urbs() after usb_kill_urb() on multiprocessor
systems create a race condition in which usb_kill_anchored_urbs() deallocates
the URB before the completer callback is called in usb_kill_urb(), resulting
in a use-after-free.
To fix this, add proper lock protection to usb_kill_urb() calls that can
possibly run concurrently with usb_kill_anchored_urbs().
Reported-by: syzbot+89bd486af9427a9fc605@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=cabffad18eb74197f84871802fd2c5117b61febf
Signed-off-by: Brooke Basile <brookebasile@...il.com>
---
drivers/net/wireless/ath/ath9k/hif_usb.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index 3f563e02d17d..2ed98aaed6fb 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -449,10 +449,19 @@ static void hif_usb_stop(void *hif_handle)
spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
/* The pending URBs have to be canceled. */
+ spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
list_for_each_entry_safe(tx_buf, tx_buf_tmp,
&hif_dev->tx.tx_pending, list) {
+ usb_get_urb(tx_buf->urb);
+ spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
usb_kill_urb(tx_buf->urb);
+ list_del(&tx_buf->list);
+ usb_free_urb(tx_buf->urb);
+ kfree(tx_buf->buf);
+ kfree(tx_buf);
+ spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
}
+ spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
}
@@ -762,27 +771,37 @@ static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
unsigned long flags;
+ spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
list_for_each_entry_safe(tx_buf, tx_buf_tmp,
&hif_dev->tx.tx_buf, list) {
+ usb_get_urb(tx_buf->urb);
+ spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
usb_kill_urb(tx_buf->urb);
list_del(&tx_buf->list);
usb_free_urb(tx_buf->urb);
kfree(tx_buf->buf);
kfree(tx_buf);
+ spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
}
+ spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
+ spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
list_for_each_entry_safe(tx_buf, tx_buf_tmp,
&hif_dev->tx.tx_pending, list) {
+ usb_get_urb(tx_buf->urb);
+ spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
usb_kill_urb(tx_buf->urb);
list_del(&tx_buf->list);
usb_free_urb(tx_buf->urb);
kfree(tx_buf->buf);
kfree(tx_buf);
+ spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
}
+ spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
}
--
2.28.0
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