1 files changed, 8 insertions, 0 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 6bb680671088..7491e73d9253 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -347,6 +347,14 @@ static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger,
         struct mpc_intsrc mp_irq;
 
         /*
+         * Check bus_irq boundary.
+         */
+        if (bus_irq >= NR_IRQS_LEGACY) {
+                pr_warn("Invalid bus_irq %u for legacy override\n", bus_irq);
+                return;
+        }
+
+        /*
          * Convert 'gsi' to 'ioapic.pin'.
          */
         ioapic = mp_find_ioapic(gsi);