linux-kernel - Re: [syzbot] [usb?] INFO: task hung in uevent

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Message-ID: <c2b2b02d-2571-451c-bb1c-7dde18b45d4f@I-love.SAKURA.ne.jp>
Date: Wed, 9 Jul 2025 13:39:18 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: syzbot+592e2ab8775dbe0bf09a@...kaller.appspotmail.com,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [syzbot] [usb?] INFO: task hung in uevent_show (2)

#syz test

diff --git a/drivers/media/rc/imon.c b/drivers/media/rc/imon.c
index f5221b018808..10124a26ffde 100644
--- a/drivers/media/rc/imon.c
+++ b/drivers/media/rc/imon.c
@@ -1765,7 +1765,7 @@ static void usb_rx_callback_intf0(struct urb *urb)
 		break;
 
 	default:
-		dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
+		dev_warn_ratelimited(ictx->dev, "imon %s: status(%d): ignored\n",
 			 __func__, urb->status);
 		break;
 	}
@@ -1806,7 +1806,7 @@ static void usb_rx_callback_intf1(struct urb *urb)
 		break;
 
 	default:
-		dev_warn(ictx->dev, "imon %s: status(%d): ignored\n",
+		dev_warn_ratelimited(ictx->dev, "imon %s: status(%d): ignored\n",
 			 __func__, urb->status);
 		break;
 	}
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 92c752f5446f..baf536c56c21 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -1985,6 +1985,9 @@ void usb_sg_wait(struct usb_sg_request *io);
 static inline unsigned int __create_pipe(struct usb_device *dev,
 		unsigned int endpoint)
 {
+	BUG_ON(dev->devnum < 0);
+	BUG_ON(dev->devnum > 0x7F);
+	BUG_ON(endpoint > 0xF);
 	return (dev->devnum << 8) | (endpoint << 15);
 }