[PATCH 4.20 041/145] usb: r8a66597: Fix a possible concurrency use-after-free bug in r8a66597_endpoint_disable()

From: Greg Kroah-Hartman
Date: Mon Jan 07 2019 - 07:35:35 EST

4.20-stable review patch. If anyone has any objections, please let me know.


From: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>

commit c85400f886e3d41e69966470879f635a2b50084c upstream.

The function r8a66597_endpoint_disable() and r8a66597_urb_enqueue() may
be concurrently executed.
The two functions both access a possible shared variable "hep->hcpriv".

This shared variable is freed by r8a66597_endpoint_disable() via the
call path:
kfree(hep->hcpriv) (line 1995 in Linux-4.19)

This variable is read by r8a66597_urb_enqueue() via the call path:
pipe = hep->hcpriv (line 802 in Linux-4.19)

The read operation is protected by a spinlock, but the free operation
is not protected by this spinlock, thus a concurrency use-after-free bug
may occur.

To fix this bug, the spin-lock and spin-unlock function calls in
r8a66597_endpoint_disable() are moved to protect the free operation.

Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/usb/host/r8a66597-hcd.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -1979,6 +1979,8 @@ static int r8a66597_urb_dequeue(struct u

static void r8a66597_endpoint_disable(struct usb_hcd *hcd,
struct usb_host_endpoint *hep)
struct r8a66597 *r8a66597 = hcd_to_r8a66597(hcd);
struct r8a66597_pipe *pipe = (struct r8a66597_pipe *)hep->hcpriv;
@@ -1991,13 +1993,14 @@ static void r8a66597_endpoint_disable(st
pipenum = pipe->info.pipenum;

+ spin_lock_irqsave(&r8a66597->lock, flags);
if (pipenum == 0) {
hep->hcpriv = NULL;
+ spin_unlock_irqrestore(&r8a66597->lock, flags);

- spin_lock_irqsave(&r8a66597->lock, flags);
pipe_stop(r8a66597, pipe);
pipe_irq_disable(r8a66597, pipenum);
disable_irq_empty(r8a66597, pipenum);