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From: "Viktor Jägersküpper" <viktor_jaegerskuepper@freenet.de>
To: Roman Mamedov <rm@romanrm.net>, Kalle Valo <kvalo@codeaurora.org>
Cc: Qiujun Huang <hqjagain@gmail.com>,
	ath9k-devel@qca.qualcomm.com, davem@davemloft.net,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, anenbupt@gmail.com,
	syzkaller-bugs@googlegroups.com
Subject: [PATCH v2] Revert "ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb"
Date: Wed, 1 Jul 2020 23:32:28 +0200	[thread overview]
Message-ID: <09616727-e09a-73af-7ee0-33d59278ff44@freenet.de> (raw)
In-Reply-To: <20200702005603.495c5d98@natsu>

This reverts commit 2bbcaaee1fcb ("ath9k: Fix general protection fault
in ath9k_hif_usb_rx_cb") because the driver gets stuck like this:

  [    5.778803] usb 1-5: Manufacturer: ATHEROS
  [   21.697488] usb 1-5: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
  [   21.701377] usbcore: registered new interface driver ath9k_htc
  [   22.053705] usb 1-5: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008
  [   22.306182] ath9k_htc 1-5:1.0: ath9k_htc: HTC initialized with 33 credits
  [  115.708513] ath9k_htc: Failed to initialize the device
  [  115.708683] usb 1-5: ath9k_htc: USB layer deinitialized

Reported-by: Roman Mamedov <rm@romanrm.net>
Ref: https://bugzilla.kernel.org/show_bug.cgi?id=208251
Fixes: 2bbcaaee1fcb ("ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb")
Tested-by: Viktor Jägersküpper <viktor_jaegerskuepper@freenet.de>
Signed-off-by: Viktor Jägersküpper <viktor_jaegerskuepper@freenet.de>
---
Changes:
  - Use correct line indentations (Thanks, Roman!)
  - Use shorter commit reference in commit log
---
 drivers/net/wireless/ath/ath9k/hif_usb.c | 48 ++++++------------------
 drivers/net/wireless/ath/ath9k/hif_usb.h |  5 ---
 2 files changed, 11 insertions(+), 42 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index 4ed21dad6a8e..6049d3766c64 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -643,9 +643,9 @@ static void ath9k_hif_usb_rx_stream(struct hif_device_usb *hif_dev,
 
 static void ath9k_hif_usb_rx_cb(struct urb *urb)
 {
-	struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
-	struct hif_device_usb *hif_dev = rx_buf->hif_dev;
-	struct sk_buff *skb = rx_buf->skb;
+	struct sk_buff *skb = (struct sk_buff *) urb->context;
+	struct hif_device_usb *hif_dev =
+		usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 	int ret;
 
 	if (!skb)
@@ -685,15 +685,14 @@ static void ath9k_hif_usb_rx_cb(struct urb *urb)
 	return;
 free:
 	kfree_skb(skb);
-	kfree(rx_buf);
 }
 
 static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 {
-	struct rx_buf *rx_buf = (struct rx_buf *)urb->context;
-	struct hif_device_usb *hif_dev = rx_buf->hif_dev;
-	struct sk_buff *skb = rx_buf->skb;
+	struct sk_buff *skb = (struct sk_buff *) urb->context;
 	struct sk_buff *nskb;
+	struct hif_device_usb *hif_dev =
+		usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
 	int ret;
 
 	if (!skb)
@@ -751,7 +750,6 @@ static void ath9k_hif_usb_reg_in_cb(struct urb *urb)
 	return;
 free:
 	kfree_skb(skb);
-	kfree(rx_buf);
 	urb->context = NULL;
 }
 
@@ -797,7 +795,7 @@ static int ath9k_hif_usb_alloc_tx_urbs(struct hif_device_usb *hif_dev)
 	init_usb_anchor(&hif_dev->mgmt_submitted);
 
 	for (i = 0; i < MAX_TX_URB_NUM; i++) {
-		tx_buf = kzalloc(sizeof(*tx_buf), GFP_KERNEL);
+		tx_buf = kzalloc(sizeof(struct tx_buf), GFP_KERNEL);
 		if (!tx_buf)
 			goto err;
 
@@ -834,9 +832,8 @@ static void ath9k_hif_usb_dealloc_rx_urbs(struct hif_device_usb *hif_dev)
 
 static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 {
-	struct rx_buf *rx_buf = NULL;
-	struct sk_buff *skb = NULL;
 	struct urb *urb = NULL;
+	struct sk_buff *skb = NULL;
 	int i, ret;
 
 	init_usb_anchor(&hif_dev->rx_submitted);
@@ -844,12 +841,6 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 
 	for (i = 0; i < MAX_RX_URB_NUM; i++) {
 
-		rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
-		if (!rx_buf) {
-			ret = -ENOMEM;
-			goto err_rxb;
-		}
-
 		/* Allocate URB */
 		urb = usb_alloc_urb(0, GFP_KERNEL);
 		if (urb == NULL) {
@@ -864,14 +855,11 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 			goto err_skb;
 		}
 
-		rx_buf->hif_dev = hif_dev;
-		rx_buf->skb = skb;
-
 		usb_fill_bulk_urb(urb, hif_dev->udev,
 				  usb_rcvbulkpipe(hif_dev->udev,
 						  USB_WLAN_RX_PIPE),
 				  skb->data, MAX_RX_BUF_SIZE,
-				  ath9k_hif_usb_rx_cb, rx_buf);
+				  ath9k_hif_usb_rx_cb, skb);
 
 		/* Anchor URB */
 		usb_anchor_urb(urb, &hif_dev->rx_submitted);
@@ -897,8 +885,6 @@ static int ath9k_hif_usb_alloc_rx_urbs(struct hif_device_usb *hif_dev)
 err_skb:
 	usb_free_urb(urb);
 err_urb:
-	kfree(rx_buf);
-err_rxb:
 	ath9k_hif_usb_dealloc_rx_urbs(hif_dev);
 	return ret;
 }
@@ -910,21 +896,14 @@ static void ath9k_hif_usb_dealloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 
 static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 {
-	struct rx_buf *rx_buf = NULL;
-	struct sk_buff *skb = NULL;
 	struct urb *urb = NULL;
+	struct sk_buff *skb = NULL;
 	int i, ret;
 
 	init_usb_anchor(&hif_dev->reg_in_submitted);
 
 	for (i = 0; i < MAX_REG_IN_URB_NUM; i++) {
 
-		rx_buf = kzalloc(sizeof(*rx_buf), GFP_KERNEL);
-		if (!rx_buf) {
-			ret = -ENOMEM;
-			goto err_rxb;
-		}
-
 		/* Allocate URB */
 		urb = usb_alloc_urb(0, GFP_KERNEL);
 		if (urb == NULL) {
@@ -939,14 +918,11 @@ static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 			goto err_skb;
 		}
 
-		rx_buf->hif_dev = hif_dev;
-		rx_buf->skb = skb;
-
 		usb_fill_int_urb(urb, hif_dev->udev,
 				  usb_rcvintpipe(hif_dev->udev,
 						  USB_REG_IN_PIPE),
 				  skb->data, MAX_REG_IN_BUF_SIZE,
-				  ath9k_hif_usb_reg_in_cb, rx_buf, 1);
+				  ath9k_hif_usb_reg_in_cb, skb, 1);
 
 		/* Anchor URB */
 		usb_anchor_urb(urb, &hif_dev->reg_in_submitted);
@@ -972,8 +948,6 @@ static int ath9k_hif_usb_alloc_reg_in_urbs(struct hif_device_usb *hif_dev)
 err_skb:
 	usb_free_urb(urb);
 err_urb:
-	kfree(rx_buf);
-err_rxb:
 	ath9k_hif_usb_dealloc_reg_in_urbs(hif_dev);
 	return ret;
 }
diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.h b/drivers/net/wireless/ath/ath9k/hif_usb.h
index 5985aa15ca93..a94e7e1c86e9 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.h
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.h
@@ -86,11 +86,6 @@ struct tx_buf {
 	struct list_head list;
 };
 
-struct rx_buf {
-	struct sk_buff *skb;
-	struct hif_device_usb *hif_dev;
-};
-
 #define HIF_USB_TX_STOP  BIT(0)
 #define HIF_USB_TX_FLUSH BIT(1)
 
--
2.27.0

  reply	other threads:[~2020-07-01 21:35 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-04  4:18 [PATCH 0/5] ath9k: bug fixes Qiujun Huang
2020-04-04  4:18 ` [PATCH 1/5] ath9k: Fix use-after-free Read in htc_connect_service Qiujun Huang
2020-04-07  5:01   ` Kalle Valo
2020-04-07 10:51   ` Dan Carpenter
2020-04-04  4:18 ` [PATCH 2/5] ath9k: Fix use-after-free Read in ath9k_wmi_ctrl_rx Qiujun Huang
2020-04-04  4:18 ` [PATCH 3/5] ath9k: Fix use-after-free Write in ath9k_htc_rx_msg Qiujun Huang
2020-04-04  4:18 ` [PATCH 4/5 resend] ath9x: Fix stack-out-of-bounds Write in ath9k_hif_usb_rx_cb Qiujun Huang
2020-04-04  4:18 ` [PATCH 5/5] ath9k: Fix general protection fault " Qiujun Huang
2020-04-07 12:50   ` Dan Carpenter
2020-06-20 21:04   ` [BISECTED REGRESSION] " Roman Mamedov
2020-06-22 14:36     ` Kalle Valo
2020-07-01 15:53       ` [PATCH] Revert "ath9k: Fix general protection fault in ath9k_hif_usb_rx_cb" Viktor Jägersküpper
2020-07-01 19:56         ` Roman Mamedov
2020-07-01 21:32           ` Viktor Jägersküpper [this message]
2020-07-02  6:43         ` Kalle Valo
2020-07-09 14:36           ` Viktor Jägersküpper
2020-07-13 14:26             ` Kalle Valo

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