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: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 09a54c731852383a61ebcd493db4d05ad596bf28..39332d3bfd9acdbe25cbff11c9c5bea57dec6b95 100644 (file)
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -286,7 +286,8 @@ 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;
 }