linux-kernel - [PATCH v2] phy: renesas: rcar-gen3-usb2: Fix sysfs interface of "role"

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Date:   Mon,  7 Oct 2019 16:55:10 +0900
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     kishon@...com
Cc:     linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        stable@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: [PATCH v2] phy: renesas: rcar-gen3-usb2: Fix sysfs interface of "role"

Since the role_store() uses strncmp(), it's possible to refer
out-of-memory if the sysfs data size is smaller than strlen("host").
This patch fixes it by using sysfs_streq() instead of strncmp().

Reported-by: Pavel Machek <pavel@...x.de>
Fixes: 9bb86777fb71 ("phy: rcar-gen3-usb2: add sysfs for usb role swap")
Cc: <stable@...r.kernel.org> # v4.10+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Acked-by: Pavel Machek <pavel@...x.de>
---
 Changes from v1:
 - Rebase on v5.4-rc2.
 - Add Reviewed-by and Acked-by tags.
 https://patchwork.kernel.org/patch/11067371/


 drivers/phy/renesas/phy-rcar-gen3-usb2.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index b7f6b13..6fd1390 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -21,6 +21,7 @@
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
+#include <linux/string.h>
 #include <linux/usb/of.h>
 #include <linux/workqueue.h>
 
@@ -320,9 +321,9 @@ static ssize_t role_store(struct device *dev, struct device_attribute *attr,
 	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
 		return -EIO;
 
-	if (!strncmp(buf, "host", strlen("host")))
+	if (sysfs_streq(buf, "host"))
 		new_mode = PHY_MODE_USB_HOST;
-	else if (!strncmp(buf, "peripheral", strlen("peripheral")))
+	else if (sysfs_streq(buf, "peripheral"))
 		new_mode = PHY_MODE_USB_DEVICE;
 	else
 		return -EINVAL;
-- 
2.7.4