[v2] usb: gadget: f_fs: Prevent race between functionfs_unbind & ffs_ep0_queue_wait

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While performing fast composition switch, there is a possibility that the
process of ffs_ep0_write/ffs_ep0_read get into a race condition
due to ep0req being freed up from functionfs_unbind.

Consider the scenario that the ffs_ep0_write calls the ffs_ep0_queue_wait
by taking a lock &ffs->ev.waitq.lock. However, the functionfs_unbind isn't
bounded so it can go ahead and mark the ep0req to NULL, and since there
is no NULL check in ffs_ep0_queue_wait we will end up in use-after-free.

Fix this by making a serialized execution between the two functions using
a mutex_lock(ffs->mutex). Also, dequeue the ep0req to ensure that no
other function can use it after the free operation.

Fixes: ddf8abd25994 ("USB: f_fs: the FunctionFS driver")
Signed-off-by: Udipto Goswami <quic_ugoswami@xxxxxxxxxxx>
---
v2: Replaces spinlock with mutex & added dequeue operation in unbind.

 drivers/usb/gadget/function/f_fs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 73dc10a77cde..1439449df39a 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -279,6 +279,9 @@ static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len)
 	struct usb_request *req = ffs->ep0req;
 	int ret;
 
+	if (!req)
+		return -EINVAL;
+
 	req->zero     = len < le16_to_cpu(ffs->ev.setup.wLength);
 
 	spin_unlock_irq(&ffs->ev.waitq.lock);
@@ -1892,10 +1895,14 @@ static void functionfs_unbind(struct ffs_data *ffs)
 	ENTER();
 
 	if (!WARN_ON(!ffs->gadget)) {
+		mutex_lock(&ffs->mutex);
+		/* dequeue before freeing ep0req */
+		usb_ep_dequeue(ffs->gadget->ep0, ffs->ep0req);
 		usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req);
 		ffs->ep0req = NULL;
 		ffs->gadget = NULL;
 		clear_bit(FFS_FL_BOUND, &ffs->flags);
+		mutex_unlock(&ffs->mutex);
 		ffs_data_put(ffs);
 	}
 }
-- 
2.17.1




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