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Message-Id: <20230223083800.31347-1-jgross@suse.com>
Date: Thu, 23 Feb 2023 09:38:00 +0100
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org
Cc: johan+linaro@...nel.org, Juergen Gross <jgross@...e.com>,
Marc Zyngier <maz@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] irqdomain: fix regression for Xen guests
The recent switch to per-domain locking caused a NULL dereference in
irq_domain_create_hierarchy(), as Xen code is calling
msi_create_irq_domain() with a NULL parent pointer.
Fix that by testing parent to be set before dereferencing it. For a
non-existing parent the irq-domain's root will stay to point to
itself.
Fixes: 9dbb8e3452ab ("irqdomain: Switch to per-domain locking")
Signed-off-by: Juergen Gross <jgross@...e.com>
---
kernel/irq/irqdomain.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index aa5b7eeeceb8..6522dfb2e49c 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1172,7 +1172,8 @@ struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
domain = __irq_domain_create(fwnode, 0, ~0, 0, ops, host_data);
if (domain) {
- domain->root = parent->root;
+ if (parent)
+ domain->root = parent->root;
domain->parent = parent;
domain->flags |= flags;
--
2.35.3
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