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coresight: checking for NULL string in coresight_name_match()

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commit fadf3a44e9 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@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier
2015-12-17 08:47:02 -07:00
committed by Greg Kroah-Hartman
parent 5c6f666742
commit 53cc688d09
1 changed files with 1 additions and 1 deletions
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2
drivers/hwtracing/coresight/coresight.c
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@@ -548,7 +548,7 @@ 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;