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author | Juergen Gross <jgross@suse.com> | 2015-02-26 06:52:05 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 15:06:56 +0100 |
commit | a5b8311fe0adc3d83b353c8e13899ea71bc51723 (patch) | |
tree | ba692ddf6f360c8c231e7ff933a42338199ef35f /drivers/xen/xen-pciback/conf_space.h | |
parent | 472cd1f6c9bfb48d5bab283dbf123837dd4e2cbb (diff) |
xen/events: avoid NULL pointer dereference in dom0 on large machines
commit 85e40b0539b24518c8bdf63e2605c8522377d00f upstream.
Using the pvops kernel a NULL pointer dereference was detected on a
large machine (144 processors) when booting as dom0 in
evtchn_fifo_unmask() during assignment of a pirq.
The event channel in question was the first to need a new entry in
event_array[] in events_fifo.c. Unfortunately xen_irq_info_pirq_setup()
is called with evtchn being 0 for a new pirq and the real event channel
number is assigned to the pirq only during __startup_pirq().
It is mandatory to call xen_evtchn_port_setup() after assigning the
event channel number to the pirq to make sure all memory needed for the
event channel is allocated.
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/xen/xen-pciback/conf_space.h')
0 files changed, 0 insertions, 0 deletions