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KVM: PPC: Validate irqchip index in MPIC routing

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

Fixes: de9ba2f363 ("KVM: PPC: Support irq routing and irqfd for in-kernel MPIC")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/kvm/20260525051714.485D51F000E9@smtp.kernel.org/
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Signed-off-by: Yanfei Xu <yanfei.xu@bytedance.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
This commit is contained in:
Yanfei Xu 2026-05-31 21:53:26 +08:00 committed by Madhavan Srinivasan
parent 76ea125792
commit 5458b50b52
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/kvm/mpic.c
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@ -1833,7 +1833,8 @@ int kvm_set_routing_entry(struct kvm *kvm,
e->set = mpic_set_irq;
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)
goto out;
break;
case KVM_IRQ_ROUTING_MSI: