Description: can: mcba_usb: fix use-after-free on disconnect
References:
 http://www.openwall.com/lists/oss-security/2019/12/03/4
Notes:
 bwh> Introduced in 4.12 by commit 51f3baad7de9 "can: mcba_usb: Add support
 bwh> for Microchip CAN BUS Analyzer".
Bugs:
upstream: released (5.4-rc7) [4d6636498c41891d0482a914dd570343a838ad79]
4.19-upstream-stable: released (4.19.84) [ce9b94da0e043b7b0ec1bd3d0e451d956acff9c1]
4.9-upstream-stable: N/A "Vulnerable code not present"
3.16-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.3.15-1)
4.19-buster-security: released (4.19.87-1)
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"