linux-kernel - [PATCH 2/2] KVM: SVM: Fix an error code in sev_gmem_post

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Message-ID: <20240612115040.2423290-4-dan.carpenter@linaro.org>
Date: Wed, 12 Jun 2024 14:50:39 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: error27@...il.com,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Brijesh Singh <brijesh.singh@....com>,
	Michael Roth <michael.roth@....com>,
	Ashish Kalra <ashish.kalra@....com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] KVM: SVM: Fix an error code in sev_gmem_post_populate()

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@...aro.org>
---
 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