linux-kernel - [PATCH 2/3] irqchip: Fix a potential abuse of seq

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Message-Id: <762e88c3e940bd6087c35b599f2c88baff775c6b.1732093745.git.00107082@163.com>
Date: Wed, 20 Nov 2024 17:17:06 +0800
From: David Wang <00107082@....com>
To: tglx@...utronix.de
Cc: kees@...nel.org,
	linux-kernel@...r.kernel.org,
	geert@...ux-m68k.org,
	David Wang <00107082@....com>
Subject: [PATCH 2/3] irqchip: Fix a potential abuse of seq_printf() format string

Using device name as format string of seq_printf() is prone to
"Format string attack", opens possibility for exploitation.
Seq_puts() is safer and more efficient.

Signed-off-by: David Wang <00107082@....com>
---
 drivers/irqchip/irq-gic.c            | 2 +-
 drivers/irqchip/irq-mvebu-pic.c      | 2 +-
 drivers/irqchip/irq-versatile-fpga.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 3be7bd8cd8cd..8fae6dc01024 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -400,7 +400,7 @@ static void gic_irq_print_chip(struct irq_data *d, struct seq_file *p)
 	struct gic_chip_data *gic = irq_data_get_irq_chip_data(d);
 
 	if (gic->domain->pm_dev)
-		seq_printf(p, gic->domain->pm_dev->of_node->name);
+		seq_puts(p, gic->domain->pm_dev->of_node->name);
 	else
 		seq_printf(p, "GIC-%d", (int)(gic - &gic_data[0]));
 }
diff --git a/drivers/irqchip/irq-mvebu-pic.c b/drivers/irqchip/irq-mvebu-pic.c
index 08b0cc862adf..b815a60f930c 100644
--- a/drivers/irqchip/irq-mvebu-pic.c
+++ b/drivers/irqchip/irq-mvebu-pic.c
@@ -71,7 +71,7 @@ static void mvebu_pic_print_chip(struct irq_data *d, struct seq_file *p)
 {
 	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);
 
-	seq_printf(p, dev_name(&pic->pdev->dev));
+	seq_puts(p, dev_name(&pic->pdev->dev));
 }
 
 static const struct irq_chip mvebu_pic_chip = {
diff --git a/drivers/irqchip/irq-versatile-fpga.c b/drivers/irqchip/irq-versatile-fpga.c
index ca471c6fee99..0abc8934c2ee 100644
--- a/drivers/irqchip/irq-versatile-fpga.c
+++ b/drivers/irqchip/irq-versatile-fpga.c
@@ -69,7 +69,7 @@ static void fpga_irq_print_chip(struct irq_data *d, struct seq_file *p)
 {
 	struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
 
-	seq_printf(p, irq_domain_get_of_node(f->domain)->name);
+	seq_puts(p, irq_domain_get_of_node(f->domain)->name);
 }
 
 static const struct irq_chip fpga_chip = {
-- 
2.39.2