[PATCH AUTOSEL 4.19 36/60] KVM: arm/arm64: vgic: Fix kvm_device leak in vgic_its_destroy

Sasha Levin
2019-06-27T00:38:18Z

From: Dave Martin <Dave.Martin@arm.com>

[ Upstream commit 4729ec8c1e1145234aeeebad5d96d77f4ccbb00a ]

kvm_device->destroy() seems to be supposed to free its kvm_device
struct, but vgic_its_destroy() is not currently doing this,
resulting in a memory leak, resulting in kmemleak reports such as
the following:

unreferenced object 0xffff800aeddfe280 (size 128):
comm "qemu-system-aar", pid 13799, jiffies 4299827317 (age 1569.844s)
[...]
backtrace:
[<00000000a08b80e2>] kmem_cache_alloc+0x178/0x208
[<00000000dcad2bd3>] kvm_vm_ioctl+0x350/0xbc0

Fix it.

Cc: Andre Przywara <andre.przywara@arm.com>
Fixes: 1085fdc68c60 ("KVM: arm64: vgic-its: Introduce new KVM ITS device")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
virt/kvm/arm/vgic/vgic-its.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 621bb004067e..0dbe332eb343 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1750,6 +1750,7 @@ static void vgic_its_destroy(struct kvm_device *kvm_dev)

mutex_unlock(&its->its_lock);
kfree(its);
+ kfree(kvm_dev);/* alloc by kvm_ioctl_create_device, free by .destroy */
}

int vgic_its_has_attr_regs(struct kvm_device *dev,
--
2.20.1