[PATCH][usb-next] usb: core: fix memory leak on port_dev_path allocation

[Colin King]

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

Currently the allocation of port_dev_path from the call to
kobject_get_path is not being kfree'd, causing a memory leak. Fix
this by kfree'ing this at the end of the function. Add an extra
error exit path to fix one of the early leaks when envp[0] fails
to be allocated.

Detected by CoverityScan, CID#1473771 ("Resource Leak")

Fixes: 201af55da8a3 ("usb: core: added uevent for over-current")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
 drivers/usb/core/hub.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 7801bb30bdba..8ae781ce1a80 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5168,7 +5168,7 @@ static void port_over_current_notify(struct usb_port *port_dev)
 
 	envp[0] = kasprintf(GFP_KERNEL, "OVER_CURRENT_PORT=%s", port_dev_path);
 	if (!envp[0])
-		return;
+		goto exit_path;
 
 	envp[1] = kasprintf(GFP_KERNEL, "OVER_CURRENT_COUNT=%u",
 			port_dev->over_current_count);
@@ -5180,6 +5180,8 @@ static void port_over_current_notify(struct usb_port *port_dev)
 	kfree(envp[1]);
 exit:
 	kfree(envp[0]);
+exit_path:
+	kfree(port_dev_path);
 }
 
 static void port_event(struct usb_hub *hub, int port1)
-- 
2.17.1