linux-kernel - [PATCH 4.4 125/342] coresight: checking for NULL string in coresight_name

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Date:	Tue, 01 Mar 2016 23:54:25 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Tyler Baker <tyler.baker@...aro.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: [PATCH 4.4 125/342] coresight: checking for NULL string in coresight_name_match()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mathieu Poirier <mathieu.poirier@...aro.org>

commit fadf3a44e974b030e7145218ad1ab25e3ef91738 upstream.

Connection child names associated to ports can sometimes be NULL,
which is the case when booting a system on QEMU or when the Coresight
power domain isn't switched on.

This patch is adding a check to make sure a NULL string isn't fed
to strcmp(), something that avoid crashing the system.

Reported-by: Tyler Baker <tyler.baker@...aro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwtracing/coresight/coresight.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -548,7 +548,7 @@ static int coresight_name_match(struct d
 	to_match = data;
 	i_csdev = to_coresight_device(dev);
 
-	if (!strcmp(to_match, dev_name(&i_csdev->dev)))
+	if (to_match && !strcmp(to_match, dev_name(&i_csdev->dev)))
 		return 1;
 
 	return 0;