usb: phy: am335x-control: check return value of bus_find_device

This fixes a potential null pointer dereference.

Cc: <stable@vger.kernel.org> # v3.16+
Fixes: d4332013919a ("driver core: dev_get_drvdata: Don't check for NULL dev")
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David Dueck <davidcdueck@googlemail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/phy/phy-am335x-control.c b/drivers/usb/phy/phy-am335x-control.c
index 403fab772724825b16ecfd8446ab9d95386bb1cc..7b3035ff94347a519a9d54f27c45108aaaca0e9f 100644 (file)
--- a/drivers/usb/phy/phy-am335x-control.c
+++ b/drivers/usb/phy/phy-am335x-control.c
@@ -126,6 +126,9 @@ struct phy_control *am335x_get_phy_control(struct device *dev)
                return NULL;
 
        dev = bus_find_device(&platform_bus_type, NULL, node, match);
+       if (!dev)
+               return NULL;
+
        ctrl_usb = dev_get_drvdata(dev);
        if (!ctrl_usb)
                return NULL;