linux-kernel - [PATCH] USB: dbgp gadget: fix use after free in dbgp

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Message-Id: <1407688511-30063-1-git-send-email-khoroshilov@ispras.ru>
Date:	Sun, 10 Aug 2014 23:35:11 +0700
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] USB: dbgp gadget: fix use after free in dbgp_unbind()

After dbgp_bind()-dbgp_unbind() cycle happens, static variable dbgp
contains pointers to already deallocated memory (dbgp.serial and dbgp.req).
If the next dbgp_bind() fails, for example in usb_ep_alloc_request(),
dbgp_bind() calls dbgp_unbind() on failure path,
and dbgp_unbind() frees dbgp.serial that still stores a pointer
to already deallocated memory.

The patch sets pointers to NULL in dbgp_unbind().

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/usb/gadget/legacy/dbgp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/legacy/dbgp.c b/drivers/usb/gadget/legacy/dbgp.c
index 986fc511a2ed..225e385a6160 100644
--- a/drivers/usb/gadget/legacy/dbgp.c
+++ b/drivers/usb/gadget/legacy/dbgp.c
@@ -222,10 +222,12 @@ static void dbgp_unbind(struct usb_gadget *gadget)
 {
 #ifdef CONFIG_USB_G_DBGP_SERIAL
 	kfree(dbgp.serial);
+	dbgp.serial = NULL;
 #endif
 	if (dbgp.req) {
 		kfree(dbgp.req->buf);
 		usb_ep_free_request(gadget->ep0, dbgp.req);
+		dbgp.req = NULL;
 	}
 
 	gadget->ep0->driver_data = NULL;
-- 
1.9.1

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