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usb: gadget: f_fs: Ensure ep0req is dequeued before free_request

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[ 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@quicinc.com>
Tested-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Link: https://lore.kernel.org/r/20221215052906.8993-3-quic_ugoswami@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Udipto Goswami 2022-12-15 10:59:06 +05:30 committed by Greg Kroah-Hartman
parent 6dd9ea0553
commit 4b3b5cc1a7
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/gadget/function/f_fs.c
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@ -1884,6 +1884,8 @@ 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;