usb: gadget: udc: gr_udc: fix memleak on error handling path in gr_ep_init()

gr_ep_init() does not assign the allocated request anywhere if allocation
of memory for the buffer fails. This is a memory leak fixed by the given
patch.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/gadget/udc/gr_udc.c b/drivers/usb/gadget/udc/gr_udc.c
index 7164ad9800f11a8633d7f551b61011aba45e5d80..7419889ebe9ab029592610b20684e31951149edd 100644 (file)
--- a/drivers/usb/gadget/udc/gr_udc.c
+++ b/drivers/usb/gadget/udc/gr_udc.c
@@ -1980,9 +1980,12 @@ static int gr_ep_init(struct gr_udc *dev, int num, int is_in, u32 maxplimit)
 
        if (num == 0) {
                _req = gr_alloc_request(&ep->ep, GFP_ATOMIC);
+               if (!_req)
+                       return -ENOMEM;
+
                buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_ATOMIC);
-               if (!_req || !buf) {
-                       /* possible _req freed by gr_probe via gr_remove */
+               if (!buf) {
+                       gr_free_request(&ep->ep, _req);
                        return -ENOMEM;
                }