From: Michael Thalmeier <michael.thalmeier@hale.at>
Date: Thu, 18 May 2017 14:14:14 +0000 (+0200)
Subject: usb: chipidea: debug: check before accessing ci_role
X-Git-Tag: v4.14-rc1~759^2~3^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0340ff83cd4475261e7474033a381bc125b45244;p=platform%2Fkernel%2Flinux-rpi.git

usb: chipidea: debug: check before accessing ci_role

ci_role BUGs when the role is >= CI_ROLE_END.

Cc: stable@vger.kernel.org  #v3.10+
Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
---

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;
 }