diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2012-10-31 12:54:37 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2012-11-01 15:17:58 +0100 |
| commit | 7f102ebeb5bad7b723a25557234b0feb493f6134 (patch) | |
| tree | 94ba630be5be8c8f8aac432f366282ccc165502f /hw/usb | |
| parent | faccca000f27bb63fce0c71dc4ca68be1c23a8b0 (diff) | |
uhci: Don't crash on device disconnect
My recent uhci cleanup series has introduced a regression, where
qemu sometimes crashes on a device disconnect. The problem is that
the uhci code never checked for a device not / no longer existing, instead
it was relying on usb_handle_packet accepting a NULL device.
But since we now pass usb_handle_packet q->ep->dev, rather then just
a local dev variable, we crash as q->ep == NULL due to the device no longer
existing.
This patch fixes this. Note that this patch also improves over
the old behavior were we would:
1) create a queue for the device
2) create an async for the packet
3) have usb_handle_packet fail
4) destroy the async
5) wait for the queue to be idle for 32 frames
6) destroy the queue
Which was rather sub-optimal.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'hw/usb')
| -rw-r--r-- | hw/usb/hcd-uhci.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/hw/usb/hcd-uhci.c b/hw/usb/hcd-uhci.c index a06372b461..f4b555addc 100644 --- a/hw/usb/hcd-uhci.c +++ b/hw/usb/hcd-uhci.c @@ -896,6 +896,11 @@ static int uhci_handle_td(UHCIState *s, UHCIQueue *q, uint32_t qh_addr, if (q == NULL) { USBDevice *dev = uhci_find_device(s, (td->token >> 8) & 0x7f); USBEndpoint *ep = usb_ep_get(dev, pid, (td->token >> 15) & 0xf); + + if (ep == NULL) { + return uhci_handle_td_error(s, td, td_addr, USB_RET_NODEV, + int_mask); + } q = uhci_queue_new(s, qh_addr, td, ep); } async = uhci_async_alloc(q, td_addr); |