The doc says:
"The characteristics of a specific redistributor region can
be read by presetting the index field in the attr data.
Only valid for KVM_DEV_TYPE_ARM_VGIC_V3"
Unfortunately the existing code fails to read the input attr data.
Fixes: 04c110932225 ("KVM: arm/arm64: Implement KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION")
Cc: stable@xxxxxxxxxxxxxxx#v4.17+
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
Reviewed-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
---
v1 -> v2:
- in the commit message, remove the statement that the index always is 0
- add Alexandru's R-b
---
arch/arm64/kvm/vgic/vgic-kvm-device.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c
index 44419679f91ad..2f66cf2472825 100644
--- a/arch/arm64/kvm/vgic/vgic-kvm-device.c
+++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c
@@ -226,6 +226,9 @@ static int vgic_get_common_attr(struct kvm_device *dev,
u64 addr;
unsigned long type = (unsigned long)attr->attr;
+ if (copy_from_user(&addr, uaddr, sizeof(addr)))
+ return -EFAULT;
+
r = kvm_vgic_addr(dev->kvm, type, &addr, false);
if (r)
return (r == -ENODEV) ? -ENXIO : r;
--
2.26.3
