linux-kernel - [PATCH]irq/core:Add a length limitation

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Date:	Tue, 24 Nov 2009 21:47:54 +0800
From:	"Liuweni" <qingshenlwy@...il.com>
To:	"linux-kernel" <linux-kernel@...r.kernel.org>
Cc:	"xgr178" <xgr178@....com>, "Jiri Kosina" <jkosina@...e.cz>,
	"qingshenlwy" <qingshenlwy@....com>
Subject: [PATCH]irq/core:Add a length limitation

In the register_handler_proc(), the max length of irqaction->name is MAX_NAMELEN.
And this function will call name_unique() to compare name with other irqs'.
There is no any code for limitation the length.
I add a warning in the function to notice that the irqaction->name is too long.

Signed-off-by: Liuwenyi <qingshenlwy@...il.com>
---
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 0832145..9ab6e04 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -196,6 +196,9 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)
 	char name [MAX_NAMELEN];
 	struct irq_desc *desc = irq_to_desc(irq);
 
+	if(strlen(action->name) >= MAX_NAMELEN)
+		WARN_ON(1);
+
 	if (!desc->dir || action->dir || !action->name ||
 					!name_unique(irq, action))
 		return;
---

Best Regards,
Liuweni
2009-11-24

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