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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: [PATCH v1 1/1] genirq: Consistently use '%u' format specifier for irq
Date: Fri,  9 May 2025 18:46:42 +0300	[thread overview]
Message-ID: <20250509154643.1499171-1-andriy.shevchenko@linux.intel.com> (raw)

There are three cases in the genirq code when the irq, as an unsigned
integer variable, is converted to text representation by sprintf().
In two cases it uses '%d' specifier which is for signed values. While
it's not a problem right now, potentially it might be in the future
in case too big (> INT_MAX) number will appear there.

Consistently use '%u' format specifier for irq which is declared as
unsigned int in all these cases.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 kernel/irq/debugfs.c | 2 +-
 kernel/irq/proc.c    | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/debugfs.c b/kernel/irq/debugfs.c
index 9004a17b93a2..3d6a5b3cfaf3 100644
--- a/kernel/irq/debugfs.c
+++ b/kernel/irq/debugfs.c
@@ -230,7 +230,7 @@ void irq_add_debugfs_entry(unsigned int irq, struct irq_desc *desc)
 	if (!irq_dir || !desc || desc->debugfs_file)
 		return;
 
-	sprintf(name, "%d", irq);
+	sprintf(name, "%u", irq);
 	desc->debugfs_file = debugfs_create_file(name, 0644, irq_dir, desc,
 						 &dfs_irq_ops);
 }
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 94eba9a425c4..29c2404e743b 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -309,7 +309,7 @@ static bool name_unique(unsigned int irq, struct irqaction *new_action)
 
 void register_handler_proc(unsigned int irq, struct irqaction *action)
 {
-	char name [MAX_NAMELEN];
+	char name[MAX_NAMELEN];
 	struct irq_desc *desc = irq_to_desc(irq);
 
 	if (!desc->dir || action->dir || !action->name || !name_unique(irq, action))
@@ -345,7 +345,7 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
 		return;
 
 	/* create /proc/irq/1234 */
-	sprintf(name, "%d", irq);
+	sprintf(name, "%u", irq);
 	desc->dir = proc_mkdir(name, root_irq_dir);
 	if (!desc->dir)
 		return;
-- 
2.47.2


             reply	other threads:[~2025-05-09 15:46 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-05-09 15:46 Andy Shevchenko [this message]
2025-05-13  7:46 ` [tip: irq/core] genirq: Consistently use '%u' format specifier for unsigned int variables tip-bot2 for Andy Shevchenko

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