From 56583c9472979ca4388313085f921f79047b51d8 Mon Sep 17 00:00:00 2001 From: Udipto Goswami Date: Thu, 15 Dec 2022 10:59:06 +0530 Subject: [PATCH] UPSTREAM: usb: gadget: f_fs: Ensure ep0req is dequeued before free_request 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 Tested-by: Krishna Kurapati Link: https://lore.kernel.org/r/20221215052906.8993-3-quic_ugoswami@quicinc.com Signed-off-by: Greg Kroah-Hartman Bug: 265837309 (cherry picked from commit ce405d561b020e5a46340eb5146805a625dcacee https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/ usb-linus) Change-Id: Idbc5f13cedac59cbc893d229383b01662f4e4a03 Signed-off-by: Prashanth K --- 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 42a37a803849..f49f8706fbd3 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1894,6 +1894,8 @@ 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;