From 67e880fe9aca998a993716e113fdcad808480afc Mon Sep 17 00:00:00 2001
From: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Tue, 28 Aug 2012 14:02:10 +0800
Subject: [PATCH] pci: Guard against wrong user supplied IRQ assignment

---
 sys/bus/pci/pci.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/sys/bus/pci/pci.c b/sys/bus/pci/pci.c
index 1fb6d954df..ad8b277983 100644
--- a/sys/bus/pci/pci.c
+++ b/sys/bus/pci/pci.c
@@ -2701,8 +2701,17 @@ pci_assign_interrupt(device_t bus, device_t dev, int force_route)
 		if (irq >= 255 || irq <= 0) {
 			irq = PCI_INVALID_IRQ;
 		} else {
-			BUS_CONFIG_INTR(bus, dev, irq,
-			    INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
+			if (machintr_legacy_intr_find(irq,
+			    INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW) < 0) {
+				device_printf(dev,
+				    "hw.pci%d.%d.%d.%d.INT%c.irq=%d, invalid\n",
+				    cfg->domain, cfg->bus, cfg->slot, cfg->func,
+				    cfg->intpin + 'A' - 1, irq);
+				irq = PCI_INVALID_IRQ;
+			} else {
+				BUS_CONFIG_INTR(bus, dev, irq,
+				    INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
+			}
 		}
 	}
 
-- 
2.41.0