[PATCH 11/12] irqchip/loongson-pch-pic: validate MADT LPC-PIC entries

[Jiale Yao]

The PCH-PIC cascade callback passes a typed LPC-PIC record to
initialization code without checking that the complete structure is
present. Reject truncated entries before dispatching them.

Fixes: bcdd75c596c8 ("irqchip/loongson-pch-pic: Add ACPI init support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 drivers/irqchip/irq-loongson-pch-pic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index 98fc1770e2a5..49eb81add098 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -432,6 +432,9 @@ static int __init pch_lpc_parse_madt(union acpi_subtable_headers *header,
 {
 	struct acpi_madt_lpc_pic *pchlpc_entry = (struct acpi_madt_lpc_pic *)header;
 
+	if (BAD_MADT_ENTRY(pchlpc_entry, end))
+		return -EINVAL;
+
 	return pch_lpc_acpi_init(pch_pic_priv[0]->pic_domain, pchlpc_entry);
 }
 
-- 
2.34.1