linux-kernel - [PATCH] input: cm109: fix URB submitted while active

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Date:   Wed,  4 Aug 2021 17:58:01 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     dmitry.torokhov@...il.com, aeh@...org
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>,
        syzbot+2d6d691af5ab4b7e66df@...kaller.appspotmail.com
Subject: [PATCH] input: cm109: fix URB submitted while active

Syzbot reported, that dev->urb_ctl was submitted while active. The
problem was in missing validation check. We should check, that dev->urb_ctl
is not pending before sumbitting it again.

Fail log:

URB 00000000cfeee59c submitted while active
WARNING: CPU: 1 PID: 8459 at drivers/usb/core/urb.c:378 usb_submit_urb+0x1271/0x1540 drivers/usb/core/urb.c:378
...
Call Trace:
 <IRQ>
 cm109_urb_irq_callback+0x44f/0xaa0 drivers/input/misc/cm109.c:422
 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1656
 usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1726

Reported-and-tested-by: syzbot+2d6d691af5ab4b7e66df@...kaller.appspotmail.com
Fixes: c04148f915e5 ("Input: add driver for USB VoIP phones with CM109 chipset")
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 drivers/input/misc/cm109.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/misc/cm109.c b/drivers/input/misc/cm109.c
index f515fae465c3..60bddadbbe3a 100644
--- a/drivers/input/misc/cm109.c
+++ b/drivers/input/misc/cm109.c
@@ -406,7 +406,7 @@ static void cm109_urb_irq_callback(struct urb *urb)

 	dev->irq_urb_pending = 0;

-	if (likely(!dev->shutdown)) {
+	if (likely(!dev->shutdown) && likely(!dev->ctl_urb_pending)) {

 		if (dev->buzzer_state)
 			dev->ctl_data->byte[HID_OR0] |= BUZZER_ON;
-- 
2.32.0