svn commit: r351324 - head/sys/netgraph/bluetooth/drivers/ubt

[Xin LI]

Author: delphij
Date: Wed Aug 21 07:45:39 2019
New Revision: 351324
URL: https://svnweb.freebsd.org/changeset/base/351324

Log:
  Fix a panic in ubt_do_hci_request.
  
  The 'mtx' is on stack and can contain garbages that would cause mtx_init
  (and in turn lock_init) to think that the mutex was already initialized.

Modified:
  head/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c

Modified: head/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c
==============================================================================
--- head/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c	Wed Aug 21 04:54:48 2019	(r351323)
+++ head/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c	Wed Aug 21 07:45:39 2019	(r351324)
@@ -554,6 +554,7 @@ ubt_do_hci_request(struct usb_device *udev, struct ubt
 		return (USB_ERR_NORMAL_COMPLETION);
 
 	/* Initialize INTR endpoint xfer and wait for response */
+	bzero(&mtx, sizeof(mtx));
 	mtx_init(&mtx, "ubt pb", NULL, MTX_DEF);
 
 	error = usbd_transfer_setup(udev, &iface_index, xfer,