[PATCH 03/12] irqchip/gic-v5-irs: validate MADT IRS entries

[Jiale Yao]

The IRS parser uses configuration addresses and flags from a typed MADT
record without checking its size. Reject incomplete IRS records before
accessing those fields.

Fixes: 35866efa52fe ("irqchip/gic-v5: Add ACPI IRS probing")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jiale Yao <yaojiale02@xxxxxxx>
---
 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 4e60a1caaba5..0139f80934d7 100644
--- a/drivers/irqchip/irq-gic-v5-irs.c
+++ b/drivers/irqchip/irq-gic-v5-irs.c
@@ -955,6 +955,9 @@ static int __init gic_acpi_parse_madt_irs(union acpi_subtable_headers *header,
 	struct resource *r;
 	int ret;
 
+	if (BAD_MADT_ENTRY(irs, end))
+		return -EINVAL;
+
 	/* Per-IRS data structure */
 	irs_data = kzalloc_obj(*irs_data);
 	if (!irs_data)
-- 
2.34.1