linux-kernel - [PATCH v1] kernel/irq/manage: check return value of irq_data_get_irq

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Date:   Fri, 16 Sep 2022 18:53:48 -0700
From:   Li Zhong <floridsleeves@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, Li Zhong <floridsleeves@...il.com>
Subject: [PATCH v1] kernel/irq/manage: check return value of irq_data_get_irq_chip()

Check the return value chip of irq_data_get_irq_chip(), which could be
NULL and result in null pointer dereference if unchecked.

Signed-off-by: Li Zhong <floridsleeves@...il.com>
---
 kernel/irq/manage.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 40fe7806cc8c..1f967050338b 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -202,6 +202,8 @@ static void irq_validate_effective_affinity(struct irq_data *data)
 
 	if (!cpumask_empty(m))
 		return;
+	if (!chip)
+		return;
 	pr_warn_once("irq_chip %s did not update eff. affinity mask of irq %u\n",
 		     chip->name, data->irq);
 }
-- 
2.25.1