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KVM: SVM: Fix an error code in sev_gmem_post_populate()

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

Fixes: dee5a47cc7 ("KVM: SEV: Add KVM_SEV_SNP_LAUNCH_UPDATE command")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Message-ID: <20240612115040.2423290-4-dan.carpenter@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Dan Carpenter 2024-06-12 14:50:39 +03:00 committed by Paolo Bonzini
parent 696eb24ac2
commit cd2d006065
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/svm/sev.c
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@ -2290,9 +2290,10 @@ static int sev_gmem_post_populate(struct kvm *kvm, gfn_t gfn_start, kvm_pfn_t pf
if (src) { if (src) {
void *vaddr = kmap_local_pfn(pfn + i); void *vaddr = kmap_local_pfn(pfn + i);
ret = copy_from_user(vaddr, src + i * PAGE_SIZE, PAGE_SIZE); if (copy_from_user(vaddr, src + i * PAGE_SIZE, PAGE_SIZE)) {
if (ret) ret = -EFAULT;
goto err; goto err;
}
kunmap_local(vaddr); kunmap_local(vaddr);
} }