[PATCH 6.1 096/313] usb: gadget: f_fs: Ensure ep0req is dequeued before free_request

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From: Udipto Goswami <quic_ugoswami@xxxxxxxxxxx>

[ Upstream commit ce405d561b020e5a46340eb5146805a625dcacee ]

As per the documentation, function usb_ep_free_request guarantees
the request will not be queued or no longer be re-queued (or
otherwise used). However, with the current implementation it
doesn't make sure that the request in ep0 isn't reused.

Fix this by dequeuing the ep0req on functionfs_unbind before
freeing the request to align with the definition.

Fixes: ddf8abd25994 ("USB: f_fs: the FunctionFS driver")
Signed-off-by: Udipto Goswami <quic_ugoswami@xxxxxxxxxxx>
Tested-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221215052906.8993-3-quic_ugoswami@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/usb/gadget/function/f_fs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index bb6fe1f3a29d..523a961b910b 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -1895,6 +1895,8 @@ static void functionfs_unbind(struct ffs_data *ffs)
 	ENTER();
 
 	if (!WARN_ON(!ffs->gadget)) {
+		/* dequeue before freeing ep0req */
+		usb_ep_dequeue(ffs->gadget->ep0, ffs->ep0req);
 		mutex_lock(&ffs->mutex);
 		usb_ep_free_request(ffs->gadget->ep0, ffs->ep0req);
 		ffs->ep0req = NULL;
-- 
2.39.0






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