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LoongArch: KVM: Validate irqchip index in irqfd routing

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Sashiko reported that the irqchip index is not validated for LoongArch.
Add validation and reject out-of-range irqchip indexes to avoid indexing
past the routing table's chip array.

Cc: stable@vger.kernel.org
Fixes: 1928254c5c ("LoongArch: KVM: Add irqfd support")
Closes: https://lore.kernel.org/kvm/20260525051714.485D51F000E9@smtp.kernel.org/
Reported-by: Sashiko <sashiko-bot@kernel.org>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Yanfei Xu <yanfei.xu@bytedance.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Yanfei Xu 2026-06-11 20:46:43 +08:00 committed by Huacai Chen
parent ebd50de14f
commit 3474037904
1 changed files with 2 additions and 1 deletions
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3
arch/loongarch/kvm/irqfd.c
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@ -51,7 +51,8 @@ int kvm_set_routing_entry(struct kvm *kvm,
e->irqchip.irqchip = ue->u.irqchip.irqchip;
e->irqchip.pin = ue->u.irqchip.pin;
if (e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS)
if (e->irqchip.pin >= KVM_IRQCHIP_NUM_PINS ||
e->irqchip.irqchip >= KVM_NR_IRQCHIPS)
return -EINVAL;
return 0;