linux-kernel - [tip: irq/urgent] irqchip/riscv-imsic: Don't dereference before NULL pointer check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <175421648067.1420.7724899351980545543.tip-bot2@tip-bot2>
Date: Sun, 03 Aug 2025 10:21:20 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: kernel test robot <lkp@...el.com>,
 Dan Carpenter <dan.carpenter@...aro.org>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/urgent] irqchip/riscv-imsic: Don't dereference before NULL
 pointer check

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     8d260bf78488bd576e619fb53806290c2a195cba
Gitweb:        https://git.kernel.org/tip/8d260bf78488bd576e619fb53806290c2a195cba
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Sat, 02 Aug 2025 12:59:13 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sun, 03 Aug 2025 12:12:17 +02:00

irqchip/riscv-imsic: Don't dereference before NULL pointer check

Smatch warns about a dereference before check:

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

Cure it by moving the firmware node assignement after the checks.

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 <dan.carpenter@...aro.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Closes: https://lore.kernel.org/r/202507311953.NFVZkr0a-lkp@intel.com/
---
 drivers/irqchip/irq-riscv-imsic-platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
index 74a2a28..643c8e4 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -308,7 +308,6 @@ 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,
 	};
@@ -325,6 +324,7 @@ int imsic_irqdomain_init(void)
 	}
 
 	/* Create Base IRQ domain */
+	info.fwnode = imsic->fwnode,
 	imsic->base_domain = msi_create_parent_irq_domain(&info, &imsic_msi_parent_ops);
 	if (!imsic->base_domain) {
 		pr_err("%pfwP: failed to create IMSIC base domain\n", imsic->fwnode);