linux-kernel - [PATCH] KVM: SVM: Fix sparse: incorrect type in argument 1 (different base types)

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Date:   Mon, 19 Feb 2018 10:12:28 -0600
From:   Brijesh Singh <brijesh.singh@....com>
To:     kvm@...r.kernel.org
Cc:     Brijesh Singh <brijesh.singh@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Borislav Petkov <bp@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>
Subject: [PATCH] KVM: SVM: Fix sparse: incorrect type in argument 1 (different base types)

Fix sparse: incorrect type in argument 1 (different base types). Typecast
the userspace address argument.

Fixes: 0d0736f76347 (KVM: SVM: Add support for KVM_SEV_LAUNCH_MEASURE ...)
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: "Radim Krčmář" <rkrcmar@...hat.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: linux-kernel@...r.kernel.org
Cc: Joerg Roedel <joro@...tes.org>
Signed-off-by: Brijesh Singh <brijesh.singh@....com>
---
 arch/x86/kvm/svm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b3e488a74828..a2f1bb73640c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6262,7 +6262,9 @@ static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
 			goto e_free;
 		}
 
-		if (!access_ok(VERIFY_WRITE, params.uaddr, params.len)) {
+		if (!access_ok(VERIFY_WRITE,
+			       (void __user *)(uintptr_t)params.uaddr,
+			       params.len)) {
 			ret = -EFAULT;
 			goto e_free;
 		}
-- 
2.14.3