From 61bf992fc618503c910416f28afa0b015838b72b Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 25 Nov 2022 00:25:51 +0100 Subject: genirq/msi: Add size info to struct msi_domain_info To allow proper range checking especially for dynamic allocations add a size field to struct msi_domain_info. If the field is 0 then the size is unknown or unlimited (up to MSI_MAX_INDEX) to provide backwards compability. Signed-off-by: Thomas Gleixner Reviewed-by: Kevin Tian Acked-by: Marc Zyngier Link: https://lore.kernel.org/r/20221124232325.501144862@linutronix.de --- kernel/irq/msi.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'kernel/irq') diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index c368116e8b08..0a3890598b75 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -772,6 +772,17 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode, { struct irq_domain *domain; + if (info->hwsize > MSI_XA_DOMAIN_SIZE) + return NULL; + + /* + * Hardware size 0 is valid for backwards compatibility and for + * domains which are not backed by a hardware table. Grant the + * maximum index space. + */ + if (!info->hwsize) + info->hwsize = MSI_XA_DOMAIN_SIZE; + msi_domain_update_dom_ops(info); if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS) msi_domain_update_chip_ops(info); -- cgit v1.2.3