From: Anirudh Rayabharam <mail@anirudhrb.com>
To: valentina.manea.m@gmail.com, shuah@kernel.org,
gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Anirudh Rayabharam <mail@anirudhrb.com>,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: [PATCH v4 1/2] usbip: give back URBs for unsent unlink requests during cleanup
Date: Sat, 21 Aug 2021 00:31:21 +0530 [thread overview]
Message-ID: <20210820190122.16379-2-mail@anirudhrb.com> (raw)
In-Reply-To: <20210820190122.16379-1-mail@anirudhrb.com>
In vhci_device_unlink_cleanup(), the URBs for unsent unlink requests are
not given back. This sometimes causes usb_kill_urb to wait indefinitely
for that urb to be given back. syzbot has reported a hung task issue [1]
for this.
To fix this, give back the urbs corresponding to unsent unlink requests
(unlink_tx list) similar to how urbs corresponding to unanswered unlink
requests (unlink_rx list) are given back.
[1]: https://syzkaller.appspot.com/bug?id=08f12df95ae7da69814e64eb5515d5a85ed06b76
Reported-by: syzbot+74d6ef051d3d2eacf428@syzkaller.appspotmail.com
Tested-by: syzbot+74d6ef051d3d2eacf428@syzkaller.appspotmail.com
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
---
drivers/usb/usbip/vhci_hcd.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index 4ba6bcdaa8e9..190bd3d1c1f0 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -957,8 +957,32 @@ static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
spin_lock(&vdev->priv_lock);
list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
+ struct urb *urb;
+
+ /* give back urb of unsent unlink request */
pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
+
+ urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
+ if (!urb) {
+ list_del(&unlink->list);
+ kfree(unlink);
+ continue;
+ }
+
+ urb->status = -ENODEV;
+
+ usb_hcd_unlink_urb_from_ep(hcd, urb);
+
list_del(&unlink->list);
+
+ spin_unlock(&vdev->priv_lock);
+ spin_unlock_irqrestore(&vhci->lock, flags);
+
+ usb_hcd_giveback_urb(hcd, urb, urb->status);
+
+ spin_lock_irqsave(&vhci->lock, flags);
+ spin_lock(&vdev->priv_lock);
+
kfree(unlink);
}
--
2.26.2
next prev parent reply other threads:[~2021-08-20 19:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 19:01 [PATCH v4 0/2] Fix syzkaller bug: hung task in hub_port_init Anirudh Rayabharam
2021-08-20 19:01 ` Anirudh Rayabharam [this message]
2021-08-23 22:20 ` [PATCH v4 1/2] usbip: give back URBs for unsent unlink requests during cleanup Shuah Khan
2021-08-20 19:01 ` [PATCH v4 2/2] usbip: clean up code in vhci_device_unlink_cleanup Anirudh Rayabharam
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