[PATCH 02/12] irqchip/gic-v5-irs: validate MADT GICC entries

[Jiale Yao]

The IAFFID parser reads fields from a typed GICC record without checking
that the MADT entry contains the fields it accesses. Reject truncated
entries before reading them.

Fixes: 35866efa52fe ("irqchip/gic-v5: Add ACPI IRS probing")
Cc: stable at vger.kernel.org
Signed-off-by: Jiale Yao <yaojiale02 at 163.com>
---
 drivers/irqchip/irq-gic-v5-irs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v5-irs.c b/drivers/irqchip/irq-gic-v5-irs.c
index 9d60f474aa4f..4e60a1caaba5 100644
--- a/drivers/irqchip/irq-gic-v5-irs.c
+++ b/drivers/irqchip/irq-gic-v5-irs.c
@@ -891,6 +891,9 @@ static int __init gic_acpi_parse_iaffid(union acpi_subtable_headers *header,
 	struct acpi_madt_generic_interrupt *gicc = (struct acpi_madt_generic_interrupt *)header;
 	int cpu;
 
+	if (BAD_MADT_GICC_ENTRY(gicc, end))
+		return -EINVAL;
+
 	if (!(gicc->flags & (ACPI_MADT_ENABLED | ACPI_MADT_GICC_ONLINE_CAPABLE)))
 		return 0;
 
-- 
2.34.1