linux-kernel - [PATCH 1/3] KVM: x86: fix wrong return code

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Message-ID: <1566911210-30059-2-git-send-email-jan.dakinevich@virtuozzo.com>
Date:   Tue, 27 Aug 2019 13:07:04 +0000
From:   Jan Dakinevich <jan.dakinevich@...tuozzo.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Jan Dakinevich <jan.dakinevich@...tuozzo.com>,
        Denis Lunev <den@...tuozzo.com>,
        Roman Kagan <rkagan@...tuozzo.com>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: [PATCH 1/3] KVM: x86: fix wrong return code

x86_emulate_instruction(), the caller of x86_decode_insn(), expects
that x86_decode_insn()'s returning value belongs to EMULATION_* name
space. However, this function may return value from X86EMUL_* name
space.

Although, the code behaves properly (because both X86EMUL_CONTINUE and
EMULATION_OK are equal to 0) this change makes code more consistent and
it is required for further fixes.

Cc: Denis Lunev <den@...tuozzo.com>
Cc: Roman Kagan <rkagan@...tuozzo.com>
Cc: Denis Plotnikov <dplotnikov@...tuozzo.com>
Signed-off-by: Jan Dakinevich <jan.dakinevich@...tuozzo.com>
---
 arch/x86/kvm/emulate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 718f7d9..6170ddf 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -5144,7 +5144,7 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len)
 	else {
 		rc = __do_insn_fetch_bytes(ctxt, 1);
 		if (rc != X86EMUL_CONTINUE)
-			return rc;
+			goto done;
 	}
 
 	switch (mode) {
-- 
2.1.4