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-rw-r--r--hw/intc/arm_gic.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
index ea0323f969..b0a69d6386 100644
--- a/hw/intc/arm_gic.c
+++ b/hw/intc/arm_gic.c
@@ -543,7 +543,21 @@ static bool gic_eoi_split(GICState *s, int cpu, MemTxAttrs attrs)
static void gic_deactivate_irq(GICState *s, int cpu, int irq, MemTxAttrs attrs)
{
int cm = 1 << cpu;
- int group = gic_has_groups(s) && GIC_TEST_GROUP(irq, cm);
+ int group;
+
+ if (irq >= s->num_irq) {
+ /*
+ * This handles two cases:
+ * 1. If software writes the ID of a spurious interrupt [ie 1023]
+ * to the GICC_DIR, the GIC ignores that write.
+ * 2. If software writes the number of a non-existent interrupt
+ * this must be a subcase of "value written is not an active interrupt"
+ * and so this is UNPREDICTABLE. We choose to ignore it.
+ */
+ return;
+ }
+
+ group = gic_has_groups(s) && GIC_TEST_GROUP(irq, cm);
if (!gic_eoi_split(s, cpu, attrs)) {
/* This is UNPREDICTABLE; we choose to ignore it */