[PATCH 3.10 024/139] usb: chipidea: debug: check before accessing ci_role

[Willy Tarreau]

From: Michael Thalmeier <michael.thalmeier@xxxxxxx>

commit 0340ff83cd4475261e7474033a381bc125b45244 upstream.

ci_role BUGs when the role is >= CI_ROLE_END.

Cc: stable@xxxxxxxxxxxxxxx  
Signed-off-by: Michael Thalmeier <michael.thalmeier@xxxxxxx>
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 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 36a7063..5a38ca8 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -203,7 +203,8 @@ static int ci_role_show(struct seq_file *s, void *data)
 {
 	struct ci13xxx *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;
 }
-- 
2.8.0.rc2.1.gbe9624a