linux/virt/kvm
Eric Biggers 987d1149be KVM: fix unregistering coalesced mmio zone from wrong bus
If you register a kvm_coalesced_mmio_zone with '.pio = 0' but then
unregister it with '.pio = 1', KVM_UNREGISTER_COALESCED_MMIO will try to
unregister it from KVM_PIO_BUS rather than KVM_MMIO_BUS, which is a
no-op.  But it frees the kvm_coalesced_mmio_dev anyway, causing a
use-after-free.

Fix it by only unregistering and freeing the zone if the correct value
of 'pio' is provided.

Reported-by: syzbot+f87f60bb6f13f39b54e3@syzkaller.appspotmail.com
Fixes: 0804c849f1 ("kvm/x86 : add coalesced pio support")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-12-18 22:07:25 +01:00
..
arm KVM updates for v4.20 2018-10-25 17:57:35 -07:00
Kconfig KVM: arm64: Prevent KVM_COMPAT from being selected 2018-06-21 17:17:50 +01:00
async_pf.c sched/swait: Rename to exclusive 2018-06-20 11:35:56 +02:00
async_pf.h KVM: fix checkpatch.pl errors in kvm/async_pf.h 2015-06-19 17:16:25 +02:00
coalesced_mmio.c KVM: fix unregistering coalesced mmio zone from wrong bus 2018-12-18 22:07:25 +01:00
coalesced_mmio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
eventfd.c Miscellaneous bugfixes, plus a small patchlet related to Spectre v2. 2018-07-18 11:08:44 -07:00
irqchip.c KVM: use rcu access function for irq routing 2017-07-07 15:24:15 +02:00
kvm_main.c Revert "mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks" 2018-10-26 16:25:19 -07:00
vfio.c vfio: New external user group/file match 2017-06-28 13:50:05 -06:00
vfio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00