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: release-20171130_firefly~4^2~100^2~1^2~4^2~49
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=bd2e8f0a72c5608625f9501c07d446f9a48daf7e;p=firefly-linux-kernel-4.4.55.git

usb: chipidea: debug: check before accessing ci_role

commit 0340ff83cd4475261e7474033a381bc125b45244 upstream.

ci_role BUGs when the role is >= CI_ROLE_END.

Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 58c8485a0715..923379972707 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -295,7 +295,8 @@ 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;
 }