linux-kernel - [PATCH] usb: chipidea: debug: check before accessing ci

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Date:   Thu, 18 May 2017 16:14:14 +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: debug: check before accessing ci_role

ci_role BUGs when the role is >= CI_ROLE_END.

Signed-off-by: Michael Thalmeier <michael.thalmeier@...e.at>
---
 drivers/usb/chipidea/debug.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 6d23eed..1c31e8a 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -294,7 +294,8 @@ static int ci_role_show(struct seq_file *s, void *data)
 {
 	struct ci_hdrc *ci = s->private;
 
-	seq_printf(s, "%s\n", ci_role(ci)->name);
+	if (ci->role != CI_ROLE_END)
+		seq_printf(s, "%s\n", ci_role(ci)->name);
 
 	return 0;
 }
-- 
2.9.2