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[added,to,the,4.1,stable,tree] coresight: checking for NULL string in coresight_name_match()

Message ID 1455117136-28870-26-git-send-email-sasha.levin@oracle.com
State New
Headers show

Commit Message

Sasha Levin Feb. 10, 2016, 3:08 p.m. UTC 
From: Mathieu Poirier <mathieu.poirier@linaro.org>


This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

-- 
2.5.0

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Patch

===============

[ Upstream commit fadf3a44e974b030e7145218ad1ab25e3ef91738 ]

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.

Cc: <stable@vger.kernel.org> # v3.18+
Reported-by: Tyler Baker <tyler.baker@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
 drivers/hwtracing/coresight/coresight.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 894531d..046144f 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -543,7 +543,7 @@  static int coresight_name_match(struct device *dev, void *data)
 	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;