| Message ID | 20240407131109.26212-1-n.zhandarovich@fintech.ru |
|---|---|
| State | Superseded |
| Headers | show |
| Series | wifi: carl9170: add a proper sanity check for endpoints | expand |
On 4/7/24 3:11 PM, Nikita Zhandarovich wrote: > Syzkaller reports [1] hitting a warning which is caused by presence > of a wrong endpoint type at the URB sumbitting stage. While there > was a check for a specific 4th endpoint, since it can switch types > between bulk and interrupt, other endpoints are trusted implicitly. > Similar warning is triggered in a couple of other syzbot issues [2]. > > Fix the issue by doing a comprehensive check of all endpoints > taking into account difference between high- and full-speed > configuration. > > This patch has not been tested on real hardware. > > [1] Syzkaller report: > ... > WARNING: CPU: 0 PID: 4721 at drivers/usb/core/urb.c:504 usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504 > ... > Call Trace: > <TASK> > carl9170_usb_send_rx_irq_urb+0x273/0x340 drivers/net/wireless/ath/carl9170/usb.c:504 > carl9170_usb_init_device drivers/net/wireless/ath/carl9170/usb.c:939 [inline] > carl9170_usb_firmware_finish drivers/net/wireless/ath/carl9170/usb.c:999 [inline] > carl9170_usb_firmware_step2+0x175/0x240 drivers/net/wireless/ath/carl9170/usb.c:1028 > request_firmware_work_func+0x130/0x240 drivers/base/firmware_loader/main.c:1107 > process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 > worker_thread+0x669/0x1090 kernel/workqueue.c:2436 > kthread+0x2e8/0x3a0 kernel/kthread.c:376 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 > </TASK> > > [2] Related syzkaller crashes: > Link: https://syzkaller.appspot.com/bug?extid=e394db78ae0b0032cb4d > Link: https://syzkaller.appspot.com/bug?extid=9468df99cb63a4a4c4e1 > > Reported-and-tested-by: syzbot+0ae4804973be759fa420@syzkaller.appspotmail.com > Fixes: a84fab3cbfdc ("carl9170: 802.11 rx/tx processing and usb backend") > Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru> This was tricky. USB 2.0 works and was easy to test. But I had to hunt down a FULLSPEED USB Host for this. The driver loads on with a OHCI Host (Silicon Image, Inc. USB0673 (rev 06)) So, I think this would work. But see my comments below. > --- > P.S. as AR9170_USB_EP_CMD endpoint can switch between bulk and int, > I failed to find a prettier solution to this problem. Will be glad > to hear if there is a better option... > > drivers/net/wireless/ath/carl9170/usb.c | 27 +++++++++++++++++++++++++++ > 1 file changed, 27 insertions(+) > > diff --git a/drivers/net/wireless/ath/carl9170/usb.c b/drivers/net/wireless/ath/carl9170/usb.c > index c4edf8355941..66d2ad561fd3 100644 > --- a/drivers/net/wireless/ath/carl9170/usb.c > +++ b/drivers/net/wireless/ath/carl9170/usb.c > @@ -1069,6 +1069,33 @@ static int carl9170_usb_probe(struct usb_interface *intf, > ar->usb_ep_cmd_is_bulk = true; > } > > + /* Verify that all expected endpoints are present */ > + if (ar->usb_ep_cmd_is_bulk) { > + u8 bulk_ep_addr[] = { > + AR9170_USB_EP_RX | USB_DIR_IN, > + AR9170_USB_EP_TX | USB_DIR_OUT, > + AR9170_USB_EP_CMD | USB_DIR_OUT, > + 0}; > + u8 int_ep_addr[] = { > + AR9170_USB_EP_IRQ | USB_DIR_IN, > + 0}; > + if (!usb_check_bulk_endpoints(intf, bulk_ep_addr) || > + !usb_check_int_endpoints(intf, int_ep_addr)) > + return -ENODEV; Please call carl9170_free(ar); before returning here. Otherwise the "ar" will memleak'ed. > + } else { > + u8 bulk_ep_addr[] = { > + AR9170_USB_EP_RX | USB_DIR_IN, > + AR9170_USB_EP_TX | USB_DIR_OUT, > + 0}; > + u8 int_ep_addr[] = { > + AR9170_USB_EP_IRQ | USB_DIR_IN, > + AR9170_USB_EP_CMD | USB_DIR_OUT, > + 0}; > + if (!usb_check_bulk_endpoints(intf, bulk_ep_addr) || > + !usb_check_int_endpoints(intf, int_ep_addr)) > + return -ENODEV; Same here. > + } > + > usb_set_intfdata(intf, ar); > SET_IEEE80211_DEV(ar->hw, &intf->dev); >
diff --git a/drivers/net/wireless/ath/carl9170/usb.c b/drivers/net/wireless/ath/carl9170/usb.c index c4edf8355941..66d2ad561fd3 100644 --- a/drivers/net/wireless/ath/carl9170/usb.c +++ b/drivers/net/wireless/ath/carl9170/usb.c @@ -1069,6 +1069,33 @@ static int carl9170_usb_probe(struct usb_interface *intf, ar->usb_ep_cmd_is_bulk = true; } + /* Verify that all expected endpoints are present */ + if (ar->usb_ep_cmd_is_bulk) { + u8 bulk_ep_addr[] = { + AR9170_USB_EP_RX | USB_DIR_IN, + AR9170_USB_EP_TX | USB_DIR_OUT, + AR9170_USB_EP_CMD | USB_DIR_OUT, + 0}; + u8 int_ep_addr[] = { + AR9170_USB_EP_IRQ | USB_DIR_IN, + 0}; + if (!usb_check_bulk_endpoints(intf, bulk_ep_addr) || + !usb_check_int_endpoints(intf, int_ep_addr)) + return -ENODEV; + } else { + u8 bulk_ep_addr[] = { + AR9170_USB_EP_RX | USB_DIR_IN, + AR9170_USB_EP_TX | USB_DIR_OUT, + 0}; + u8 int_ep_addr[] = { + AR9170_USB_EP_IRQ | USB_DIR_IN, + AR9170_USB_EP_CMD | USB_DIR_OUT, + 0}; + if (!usb_check_bulk_endpoints(intf, bulk_ep_addr) || + !usb_check_int_endpoints(intf, int_ep_addr)) + return -ENODEV; + } + usb_set_intfdata(intf, ar); SET_IEEE80211_DEV(ar->hw, &intf->dev);
Syzkaller reports [1] hitting a warning which is caused by presence of a wrong endpoint type at the URB sumbitting stage. While there was a check for a specific 4th endpoint, since it can switch types between bulk and interrupt, other endpoints are trusted implicitly. Similar warning is triggered in a couple of other syzbot issues [2]. Fix the issue by doing a comprehensive check of all endpoints taking into account difference between high- and full-speed configuration. This patch has not been tested on real hardware. [1] Syzkaller report: ... WARNING: CPU: 0 PID: 4721 at drivers/usb/core/urb.c:504 usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504 ... Call Trace: <TASK> carl9170_usb_send_rx_irq_urb+0x273/0x340 drivers/net/wireless/ath/carl9170/usb.c:504 carl9170_usb_init_device drivers/net/wireless/ath/carl9170/usb.c:939 [inline] carl9170_usb_firmware_finish drivers/net/wireless/ath/carl9170/usb.c:999 [inline] carl9170_usb_firmware_step2+0x175/0x240 drivers/net/wireless/ath/carl9170/usb.c:1028 request_firmware_work_func+0x130/0x240 drivers/base/firmware_loader/main.c:1107 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> [2] Related syzkaller crashes: Link: https://syzkaller.appspot.com/bug?extid=e394db78ae0b0032cb4d Link: https://syzkaller.appspot.com/bug?extid=9468df99cb63a4a4c4e1 Reported-and-tested-by: syzbot+0ae4804973be759fa420@syzkaller.appspotmail.com Fixes: a84fab3cbfdc ("carl9170: 802.11 rx/tx processing and usb backend") Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru> --- P.S. as AR9170_USB_EP_CMD endpoint can switch between bulk and int, I failed to find a prettier solution to this problem. Will be glad to hear if there is a better option... drivers/net/wireless/ath/carl9170/usb.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)