usb: gadget: f_dfu.c: fix memory leak

dfu_prepare_function() allocates N+1 descriptor header structures,
the last one being the "DFU Functional Descriptor".

dfu_unbind() handles de-allocation, but fails to free the final
one (eg. "DFU Functional Descriptor"), leading to memory leak.

Fixed by incrementing counter, as in dfu_prepare_function().

Signed-off-by: Ralph Siemsen <ralph.siemsen@linaro.org>

diff --git a/drivers/usb/gadget/f_dfu.c b/drivers/usb/gadget/f_dfu.c
index 30ece524a8e142eb1fd8662eb36bdea0b1d5b842..e27f146605262792f13f05cae245e5db110abc07 100644 (file)
--- a/drivers/usb/gadget/f_dfu.c
+++ b/drivers/usb/gadget/f_dfu.c
@@ -748,6 +748,7 @@ static void dfu_unbind(struct usb_configuration *c, struct usb_function *f)
 
        if (f_dfu->function) {
                i = alt_num;
+               i++; /* free DFU Functional Descriptor */
                while (i) {
                        free(f_dfu->function[--i]);
                        f_dfu->function[i] = NULL;