From: Tao Cui <cuitao@kylinos.cn>
Date: Mon, 4 May 2026 01:00:38 +0000 (+0800)
Subject: LoongArch: KVM: Fix missing EMULATE_FAIL in kvm_emu_mmio_read()
X-Git-Tag: v7.1-rc3~34^2~4
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=f26faae96c411a70641e4d21b759475caa6122d5;p=thirdparty%2Fkernel%2Flinux.git

LoongArch: KVM: Fix missing EMULATE_FAIL in kvm_emu_mmio_read()

In the ldptr (0x24...0x27) opcode decoding path, the default case only
breaks out but without setting "ret" value to EMULATE_FAIL. This leaves
run->mmio.len uninitialized (stale from a previous MMIO operation) while
"ret" value remains EMULATE_DO_MMIO, causing the code to proceed with an
incorrect MMIO length.

Add "ret = EMULATE_FAIL" to match the other default branches in the same
function (e.g. the 0x28...0x2e and 0x38 cases).

Cc: stable@vger.kernel.org
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---

diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index da0ad89f2eb74..3b95cd0f989b0 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -390,6 +390,7 @@ int kvm_emu_mmio_read(struct kvm_vcpu *vcpu, larch_inst inst)
 			run->mmio.len = 8;
 			break;
 		default:
+			ret = EMULATE_FAIL;
 			break;
 		}
 		break;