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Description: qdio: clear intparm during shutdown
Symptom: Crash in qeth_irq() with "Unable to handle kernel pointer
dereference in virtual kernel address space".
Problem: During shutdown, qdio returns its ccw device back to control
by qeth - but doesn't reset the interrupt parameter on the
device. If qdio_shutdown() failed to terminate its
long-running IO on the ccw_device, qeth will subsequently
do so. In this case the IRQ for the IO completion is
presented to qeth_irq() with the _old_ interrupt parameter,
which gets mis-interpreted as a valid qeth_cmd_buffer
pointer. Dereferencing this bogus pointer in
qeth_release_buffer() triggers the crash.
Solution: When returning the ccw device in qdio_shutdown(), also reset
its interrupt parameter.
Reproduction: Offline an OSA CHPID with multiple active qeth interfaces.
Component: Kernel
Upstream-ID: 89286320a236d245834075fa13adb0bdd827ecaa
Reported: Ubuntu 18.04
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-177513 severity-high
targetmilestone-inin18041
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[UBUNTU] qdio: clear intparm during shutdown
https://bugs.launchpad.net/bugs/1828394
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