linux-kernel - [PATCH] stm class: correct masterID range in setting via sysfs

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Date:	Mon, 28 Mar 2016 15:55:42 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	alexander.shishkin@...ux.intel.com
Cc:	linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org,
	zhang.lyra@...il.com
Subject: [PATCH] stm class: correct masterID range in setting via sysfs

The type of masterID is defined as 'unsigned int', theoretically one
can set masterID with a number larger than 'INT_MAX' as long as
'stm_data::sw_end' is larger than 'INT_MAX'.

Also, 'stm_data::start' and 'stm_data::end' is initialized in respective
drivers which should be able to use any value less than 'UINT_MAX' for
their masterIDs, of course including those values larger than 'INT_MAX',
but the current policy is wrongly assuming that masterIDs would not be
larger than 'INT_MAX'.  This patch just corrected that.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
---
 drivers/hwtracing/stm/policy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/stm/policy.c b/drivers/hwtracing/stm/policy.c
index 1db1896..ce3edfd 100644
--- a/drivers/hwtracing/stm/policy.c
+++ b/drivers/hwtracing/stm/policy.c
@@ -107,7 +107,7 @@ stp_policy_node_masters_store(struct config_item *item, const char *page,
 		goto unlock;

 	/* must be within [sw_start..sw_end], which is an inclusive range */
-	if (first > INT_MAX || last > INT_MAX || first > last ||
+	if (first > UINT_MAX || last > UINT_MAX || first > last ||
 	    first < stm->data->sw_start ||
 	    last > stm->data->sw_end) {
 		ret = -ERANGE;
-- 
1.9.1