linux-kernel - [PATCH 3.12 108/111] MIPS: KVM: Do not sign extend on unsigned MMIO load

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Message-Id: <83de5204d38767e26524ad04e76fdc94ddd61bca.1433943052.git.jslaby@suse.cz>
Date:	Wed, 10 Jun 2015 17:27:37 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 108/111] MIPS: KVM: Do not sign extend on unsigned MMIO load

From: Nicholas Mc Guire <hofrat@...dl.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit ed9244e6c534612d2b5ae47feab2f55a0d4b4ced upstream.

Fix possible unintended sign extension in unsigned MMIO loads by casting
to uint16_t in the case of mmio_needed != 2.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Reviewed-by: James Hogan <james.hogan@...tec.com>
Tested-by: James Hogan <james.hogan@...tec.com>
Cc: Gleb Natapov <gleb@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9985/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/mips/kvm/kvm_mips_emul.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kvm/kvm_mips_emul.c b/arch/mips/kvm/kvm_mips_emul.c
index e75ef8219caf..c76f297b7149 100644
--- a/arch/mips/kvm/kvm_mips_emul.c
+++ b/arch/mips/kvm/kvm_mips_emul.c
@@ -1626,7 +1626,7 @@ kvm_mips_complete_mmio_load(struct kvm_vcpu *vcpu, struct kvm_run *run)
 		if (vcpu->mmio_needed == 2)
 			*gpr = *(int16_t *) run->mmio.data;
 		else
-			*gpr = *(int16_t *) run->mmio.data;
+			*gpr = *(uint16_t *)run->mmio.data;
 
 		break;
 	case 1:
-- 
2.4.2

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