From: Michael Thalmeier <michael.thalmeier@hale.at>
To: Peter Chen <Peter.Chen@nxp.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
michael@thalmeier.at
Subject: [PATCH] usb: chipidea: core: check before accessing ci_role in ci_role_show
Date: Fri, 19 May 2017 10:32:09 +0200 [thread overview]
Message-ID: <20170519083209.5208-1-michael.thalmeier@hale.at> (raw)
ci_role BUGs when the role is >= CI_ROLE_END.
This is the case while the role is changing.
Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
---
drivers/usb/chipidea/core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 9e217b1..fe4fe24 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -843,7 +843,10 @@ static ssize_t ci_role_show(struct device *dev, struct device_attribute *attr,
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
- return sprintf(buf, "%s\n", ci_role(ci)->name);
+ if (ci->role != CI_ROLE_END)
+ return sprintf(buf, "%s\n", ci_role(ci)->name);
+
+ return 0;
}
static ssize_t ci_role_store(struct device *dev,
--
2.9.2
reply other threads:[~2017-05-19 8:33 UTC|newest]
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