linux-kernel - [PATCH] usb: chipidea: core: check before accessing ci_role in ci_role

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Date:   Fri, 19 May 2017 10:32:09 +0200
From:   Michael Thalmeier <michael.thalmeier@...e.at>
To:     Peter Chen <Peter.Chen@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        michael@...lmeier.at
Subject: [PATCH] usb: chipidea: core: check before accessing ci_role in ci_role_show

ci_role BUGs when the role is >= CI_ROLE_END.
This is the case while the role is changing.

Signed-off-by: Michael Thalmeier <michael.thalmeier@...e.at>
---
 drivers/usb/chipidea/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 9e217b1..fe4fe24 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -843,7 +843,10 @@ static ssize_t ci_role_show(struct device *dev, struct device_attribute *attr,
 {
 	struct ci_hdrc *ci = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%s\n", ci_role(ci)->name);
+	if (ci->role != CI_ROLE_END)
+		return sprintf(buf, "%s\n", ci_role(ci)->name);
+
+	return 0;
 }
 
 static ssize_t ci_role_store(struct device *dev,
-- 
2.9.2