linux-kernel - [PATCH 4.19 035/140] phy: renesas: rcar-gen3-usb2: Fix sysfs interface of "role"

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Message-Id: <20191216174758.620659251@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:48:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pavel Machek <pavel@...x.de>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: [PATCH 4.19 035/140] phy: renesas: rcar-gen3-usb2: Fix sysfs interface of "role"

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

commit 4bd5ead82d4b877ebe41daf95f28cda53205b039 upstream.

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>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -23,6 +23,7 @@
 #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>
 
@@ -241,9 +242,9 @@ static ssize_t role_store(struct device
 	if (!ch->has_otg_pins || !ch->phy->init_count)
 		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;