linux-kernel - [PATCH] irqchip/riscv-imsic: Fix 'imsic' dereferenced before NULL check

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Message-Id: <20250801172459.94708-1-visitorckw@gmail.com>
Date: Sat,  2 Aug 2025 01:24:59 +0800
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: anup@...infault.org,
	tglx@...utronix.de,
	paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	maz@...nel.org
Cc: jserv@...s.ncku.edu.tw,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Kuan-Wei Chiu <visitorckw@...il.com>,
	kernel test robot <lkp@...el.com>,
	Dan Carpenter <error27@...il.com>
Subject: [PATCH] irqchip/riscv-imsic: Fix 'imsic' dereferenced before NULL check

Smatch reported a warning in imsic_irqdomain_init():

drivers/irqchip/irq-riscv-imsic-platform.c:317 imsic_irqdomain_init() warn: variable dereferenced before check 'imsic' (see line 311)

The variable imsic was dereferenced before being checked for NULL.
To fix this, move the initialization of struct irq_domain_info after
the NULL check to avoid accessing imsic prematurely.

Fixes: 59422904dd98 ("irqchip/riscv-imsic: Convert to msi_create_parent_irq_domain() helper")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <error27@...il.com>
Closes: https://lore.kernel.org/r/202507311953.NFVZkr0a-lkp@intel.com/
Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>
---
 drivers/irqchip/irq-riscv-imsic-platform.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
index 74a2a28f9403..04037653f274 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -307,11 +307,6 @@ static const struct msi_parent_ops imsic_msi_parent_ops = {
 
 int imsic_irqdomain_init(void)
 {
-	struct irq_domain_info info = {
-		.fwnode		= imsic->fwnode,
-		.ops		= &imsic_base_domain_ops,
-		.host_data	= imsic,
-	};
 	struct imsic_global_config *global;
 
 	if (!imsic || !imsic->fwnode) {
@@ -324,6 +319,12 @@ int imsic_irqdomain_init(void)
 		return -ENODEV;
 	}
 
+	struct irq_domain_info info = {
+		.fwnode		= imsic->fwnode,
+		.ops		= &imsic_base_domain_ops,
+		.host_data	= imsic,
+	};
+
 	/* Create Base IRQ domain */
 	imsic->base_domain = msi_create_parent_irq_domain(&info, &imsic_msi_parent_ops);
 	if (!imsic->base_domain) {
-- 
2.34.1