From db35340c536f1af0108ec9a0b2126a05d358d14a Mon Sep 17 00:00:00 2001
From: Qi Hou <qi.hou@windriver.com>
Date: Thu, 11 Jan 2018 12:54:43 +0800
Subject: [PATCH] ARM: OMAP2+: timer: fix a kmemleak caused in omap_get_timer_dt
Git-commit: db35340c536f1af0108ec9a0b2126a05d358d14a
Patch-mainline: v4.16-rc4
References: bsc#1051510

When more than one GP timers are used as kernel system timers and the
corresponding nodes in device-tree are marked with the same "disabled"
property, then the "attr" field of the property will be initialized
more than once as the property being added to sys file system via
__of_add_property_sysfs().

In __of_add_property_sysfs(), the "name" field of pp->attr.attr is set
directly to the return value of safe_name(), without taking care of
whether it's already a valid pointer to a memory block. If it is, its
old value will always be overwritten by the new one and the memory block
allocated before will a "ghost", then a kmemleak happened.

That the same "disabled" property being added to different nodes of device
tree would cause that kind of kmemleak overhead, at least once.

To fix it, allocate the property dynamically, and delete static one.

Signed-off-by: Qi Hou <qi.hou@windriver.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 arch/arm/mach-omap2/timer.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
index ece09c9461f7..d61fbd7a2840 100644
--- a/arch/arm/mach-omap2/timer.c
+++ b/arch/arm/mach-omap2/timer.c
@@ -156,12 +156,6 @@ static struct clock_event_device clockevent_gpt = {
 	.tick_resume		= omap2_gp_timer_shutdown,
 };
 
-static struct property device_disabled = {
-	.name = "status",
-	.length = sizeof("disabled"),
-	.value = "disabled",
-};
-
 static const struct of_device_id omap_timer_match[] __initconst = {
 	{ .compatible = "ti,omap2420-timer", },
 	{ .compatible = "ti,omap3430-timer", },
@@ -203,8 +197,17 @@ static struct device_node * __init omap_get_timer_dt(const struct of_device_id *
 				  of_get_property(np, "ti,timer-secure", NULL)))
 			continue;
 
-		if (!of_device_is_compatible(np, "ti,omap-counter32k"))
-			of_add_property(np, &device_disabled);
+		if (!of_device_is_compatible(np, "ti,omap-counter32k")) {
+			struct property *prop;
+
+			prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+			if (!prop)
+				return NULL;
+			prop->name = "status";
+			prop->value = "disabled";
+			prop->length = strlen(prop->value);
+			of_add_property(np, prop);
+		}
 		return np;
 	}
 
-- 
2.18.0