usb: Avoid use-after-free by flushing endpoints early in usb_set_interface()
authorMathias Nyman <mathias.nyman@linux.intel.com>
Mon, 3 Sep 2018 12:44:16 +0000 (15:44 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 5 Sep 2018 12:36:53 +0000 (14:36 +0200)
commitf9a5b4f58b280c1d26255376713c132f93837621
tree1a605f228cfbce84505cafa861eb0e52b2cf3768
parentd23df2dc56325c72b51670b1fb400ddd23dc17cd
usb: Avoid use-after-free by flushing endpoints early in usb_set_interface()

The steps taken by usb core to set a new interface is very different from
what is done on the xHC host side.

xHC hardware will do everything in one go. One command is used to set up
new endpoints, free old endpoints, check bandwidth, and run the new
endpoints.

All this is done by xHC when usb core asks the hcd to check for
available bandwidth. At this point usb core has not yet flushed the old
endpoints, which will cause use-after-free issues in xhci driver as
queued URBs are cancelled on a re-allocated endpoint.

To resolve this add a call to usb_disable_interface() which will flush
the endpoints before calling usb_hcd_alloc_bandwidth()

Additional checks in xhci driver will also be implemented to gracefully
handle stale URB cancel on freed and re-allocated endpoints

Cc: <stable@vger.kernel.org>
Reported-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/core/message.c