linux-kernel - [PATCH 4.19 08/91] usb: usbfs: fix double-free of usb memory upon submiturb error

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Message-Id: <20190814165749.494054788@linuxfoundation.org>
Date:   Wed, 14 Aug 2019 19:00:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gavin Li <git@...gavinli.com>,
        Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH 4.19 08/91] usb: usbfs: fix double-free of usb memory upon submiturb error

From: Gavin Li <git@...gavinli.com>

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@...gavinli.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20190804235044.22327-1-gavinli@thegavinli.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1792,8 +1792,6 @@ 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)