[v2] phy: renesas: rcar-gen3-usb2: Fix sysfs interface of "role"
diff mbox series

Message ID 1570434910-15343-1-git-send-email-yoshihiro.shimoda.uh@renesas.com
State Accepted
Delegated to: Geert Uytterhoeven
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  • [v2] phy: renesas: rcar-gen3-usb2: Fix sysfs interface of "role"
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Commit Message

Yoshihiro Shimoda Oct. 7, 2019, 7:55 a.m. UTC
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@denx.de>
Fixes: 9bb86777fb71 ("phy: rcar-gen3-usb2: add sysfs for usb role swap")
Cc: <stable@vger.kernel.org> # v4.10+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Pavel Machek <pavel@denx.de>
 Changes from v1:
 - Rebase on v5.4-rc2.
 - Add Reviewed-by and Acked-by tags.

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

diff mbox series

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;
 		return -EINVAL;