[PATCH 5.15 274/277] irqchip/gic, gic-v3: Prevent GSI to SGI translations

[Greg Kroah-Hartman]

From: Andre Przywara <andre.przywara@xxxxxxx>

commit 544808f7e21cb9ccdb8f3aa7de594c05b1419061 upstream.

At the moment the GIC IRQ domain translation routine happily converts
ACPI table GSI numbers below 16 to GIC SGIs (Software Generated
Interrupts aka IPIs). On the Devicetree side we explicitly forbid this
translation, actually the function will never return HWIRQs below 16 when
using a DT based domain translation.

We expect SGIs to be handled in the first part of the function, and any
further occurrence should be treated as a firmware bug, so add a check
and print to report this explicitly and avoid lengthy debug sessions.

Fixes: 64b499d8df40 ("irqchip/gic-v3: Configure SGIs as standard interrupts")
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220404110842.2882446-1-andre.przywara@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/irqchip/irq-gic-v3.c |    6 ++++++
 drivers/irqchip/irq-gic.c    |    6 ++++++
 2 files changed, 12 insertions(+)

--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1466,6 +1466,12 @@ static int gic_irq_domain_translate(stru
 		if(fwspec->param_count != 2)
 			return -EINVAL;
 
+		if (fwspec->param[0] < 16) {
+			pr_err(FW_BUG "Illegal GSI%d translation request\n",
+			       fwspec->param[0]);
+			return -EINVAL;
+		}
+
 		*hwirq = fwspec->param[0];
 		*type = fwspec->param[1];
 
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1085,6 +1085,12 @@ static int gic_irq_domain_translate(stru
 		if(fwspec->param_count != 2)
 			return -EINVAL;
 
+		if (fwspec->param[0] < 16) {
+			pr_err(FW_BUG "Illegal GSI%d translation request\n",
+			       fwspec->param[0]);
+			return -EINVAL;
+		}
+
 		*hwirq = fwspec->param[0];
 		*type = fwspec->param[1];