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Message-ID: <53940af0-d156-3117-ac86-2f3ccaee9513@freenet.de>
Date: Wed, 1 Jul 2020 17:53:27 +0200
From: Viktor Jägersküpper
<viktor_jaegerskuepper@...enet.de>
To: Kalle Valo <kvalo@...eaurora.org>, Roman Mamedov <rm@...anrm.net>
Cc: Qiujun Huang <hqjagain@...il.com>, ath9k-devel@....qualcomm.com,
davem@...emloft.net, linux-wireless@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
anenbupt@...il.com, syzkaller-bugs@...glegroups.com
Subject: [PATCH] Revert "ath9k: Fix general protection fault in
ath9k_hif_usb_rx_cb"
Kalle Valo writes:
> Roman Mamedov <rm@...anrm.net> writes:
>
>> On Sat, 4 Apr 2020 12:18:38 +0800
>> Qiujun Huang <hqjagain@...il.com> wrote:
>>
>>> In ath9k_hif_usb_rx_cb interface number is assumed to be 0.
>>> usb_ifnum_to_if(urb->dev, 0)
>>> But it isn't always true.
>>>
>>> The case reported by syzbot:
>>> https://lore.kernel.org/linux-usb/000000000000666c9c05a1c05d12@google.com
>>> usb 2-1: new high-speed USB device number 2 using dummy_hcd
>>> usb 2-1: config 1 has an invalid interface number: 2 but max is 0
>>> usb 2-1: config 1 has no interface number 0
>>> usb 2-1: New USB device found, idVendor=0cf3, idProduct=9271, bcdDevice=
>>> 1.08
>>> usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
>>> general protection fault, probably for non-canonical address
>>> 0xdffffc0000000015: 0000 [#1] SMP KASAN
>>> KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]
>>> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc5-syzkaller #0
>>>
>>> Call Trace
>>> __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650
>>> usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716
>>> dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966
>>> call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404
>>> expire_timers kernel/time/timer.c:1449 [inline]
>>> __run_timers kernel/time/timer.c:1773 [inline]
>>> __run_timers kernel/time/timer.c:1740 [inline]
>>> run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786
>>> __do_softirq+0x21e/0x950 kernel/softirq.c:292
>>> invoke_softirq kernel/softirq.c:373 [inline]
>>> irq_exit+0x178/0x1a0 kernel/softirq.c:413
>>> exiting_irq arch/x86/include/asm/apic.h:546 [inline]
>>> smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1146
>>> apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
>>>
>>> Reported-and-tested-by: syzbot+40d5d2e8a4680952f042@...kaller.appspotmail.com
>>> Signed-off-by: Qiujun Huang <hqjagain@...il.com>
>>
>> This causes complete breakage of ath9k operation across all the stable kernel
>> series it got backported to, and I guess the mainline as well. Please see:
>> https://bugzilla.kernel.org/show_bug.cgi?id=208251
>> https://bugzilla.redhat.com/show_bug.cgi?id=1848631
>
> So there's no fix for this? I was under impression that someone fixed
> this, but maybe I'm mixing with something else.
>
> If this is not fixed can someone please submit a patch to revert the
> offending commit (or commits) so that we get ath9k working again?
>
This reverts commit 2bbcaaee1fcbd83272e29f31e2bb7e70d8c49e05 ("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@...anrm.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@...enet.de>
Signed-off-by: Viktor Jägersküpper <viktor_jaegerskuepper@...enet.de>
---
I couldn't find any fix for this, so here is the patch which reverts the
offending commit. I have tested it with 5.8.0-rc3 and with 5.7.4.
Feel free to change the commit message if it is necessary or appropriate, I am
just a user affected by this bug.
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)
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