[PATCH 4.9 001/103] usb: usbfs: fix double-free of usb memory upon submiturb error

[Greg Kroah-Hartman]

From: Gavin Li <git@xxxxxxxxxxxxxx>

commit c43f28dfdc4654e738aa6d3fd08a105b2bee758d upstream.

Upon an error within proc_do_submiturb(), dec_usb_memory_use_count()
gets called once by the error handling tail and again by free_async().
Remove the first call.

Signed-off-by: Gavin Li <git@xxxxxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20190804235044.22327-1-gavinli@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/core/devio.c |    2 --
 1 file changed, 2 deletions(-)

--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1810,8 +1810,6 @@ static int proc_do_submiturb(struct usb_
 	return 0;
 
  error:
-	if (as && as->usbm)
-		dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 	kfree(isopkt);
 	kfree(dr);
 	if (as)