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KVM: SVM: Return -EFAULT if copy_to_user() for SEV mig packet header fails

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Return -EFAULT if copy_to_user() fails; if accessing user memory faults,
copy_to_user() returns the number of bytes remaining, not an error code.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Steve Rutherford <srutherford@google.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Ashish Kalra <ashish.kalra@amd.com>
Fixes: d3d1af85e2 ("KVM: SVM: Add KVM_SEND_UPDATE_DATA command")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210506175826.2166383-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-05-06 10:58:25 -07:00 • committed by Paolo Bonzini
parent 4b639a9f82
commit b4a693924a
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/svm/sev.c
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@ -1309,8 +1309,9 @@ static int sev_send_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
}
/* Copy packet header to userspace. */
ret = copy_to_user((void __user *)(uintptr_t)params.hdr_uaddr, hdr,
params.hdr_len);
if (copy_to_user((void __user *)(uintptr_t)params.hdr_uaddr, hdr,
params.hdr_len))
ret = -EFAULT;
e_free_trans_data:
kfree(trans_data);