KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache

stable inclusion
from stable-v5.10.209
commit ba7be666740847d967822bed15500656b26bc703
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I93EEI
CVE: CVE-2024-26598

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=ba7be666740847d967822bed15500656b26bc703



--------------------------------

There is a potential UAF scenario in the case of an LPI translation
cache hit racing with an operation that invalidates the cache, such
as a DISCARD ITS command. The root of the problem is that
vgic_its_check_cache() does not elevate the refcount on the vgic_irq
before dropping the lock that serializes refcount changes.

Have vgic_its_check_cache() raise the refcount on the returned vgic_irq
and add the corresponding decrement after queueing the interrupt.

Cc: stable@vger.kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240104183233.3560639-1-oliver.upton@linux.dev
(cherry picked from commit d1e388db)