From: David Woodhouse <dwmw@xxxxxxxxxxxx>
The address we give to memdup_user() isn't correctly tagged as __user.
This is harmless enough as it's a one-off use and we're doing exactly
the right thing, but fix it anyway to shut the checker up. Otherwise
it'll whine when the (now legacy) code gets moved around in a later
patch.
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 40be21f7c359..6f8aaf5860a3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2853,8 +2853,8 @@ static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
{
struct kvm *kvm = vcpu->kvm;
int lm = is_long_mode(vcpu);
- u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
- : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
+ u64 blob_addr = lm ? kvm->arch.xen_hvm_config.blob_addr_64
+ : kvm->arch.xen_hvm_config.blob_addr_32;
u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
: kvm->arch.xen_hvm_config.blob_size_32;
u32 page_num = data & ~PAGE_MASK;
@@ -2864,7 +2864,9 @@ static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
if (page_num >= blob_size)
return 1;
- page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
+ blob_addr += page_num * PAGE_SIZE;
+
+ page = memdup_user((u8 __user *)blob_addr, PAGE_SIZE);
if (IS_ERR(page))
return PTR_ERR(page);
--
2.29.2
