[PATCH 2/2] KVM: SVM: Fix an error code in sev_gmem_post_populate()

[Dan Carpenter]

The copy_from_user() function returns the number of bytes which it
was not able to copy.  Return -EFAULT instead.

Fixes: dee5a47cc7a4 ("KVM: SEV: Add KVM_SEV_SNP_LAUNCH_UPDATE command")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 arch/x86/kvm/svm/sev.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 70d8d213d401..14bb52ebd65a 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2220,9 +2220,10 @@ static int sev_gmem_post_populate(struct kvm *kvm, gfn_t gfn_start, kvm_pfn_t pf
 		if (src) {
 			void *vaddr = kmap_local_pfn(pfn + i);
 
-			ret = copy_from_user(vaddr, src + i * PAGE_SIZE, PAGE_SIZE);
-			if (ret)
+			if (copy_from_user(vaddr, src + i * PAGE_SIZE, PAGE_SIZE)) {
+				ret = -EFAULT;
 				goto err;
+			}
 			kunmap_local(vaddr);
 		}
 
-- 
2.43.0