FAILED: patch "[PATCH] KVM: arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION read" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 53b16dd6ba5cf64ed147ac3523ec34651d553cb0 Mon Sep 17 00:00:00 2001
From: Eric Auger <[email protected]>
Date: Mon, 5 Apr 2021 18:39:34 +0200
Subject: [PATCH] KVM: arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION read

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.

index 44419679f91a..2f66cf247282 100644
@@ -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;