patch "usb: gadget: f_fs: Fix use after free issue as part of queue failure" added to usb-next

This is a note to let you know that I've just added the patch titled

usb: gadget: f_fs: Fix use after free issue as part of queue failure

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-next branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release during the merge window.

If you have any questions about this process, please let me know.

From f63ec55ff904b2f2e126884fcad93175f16ab4bb Mon Sep 17 00:00:00 2001
From: Sriharsha Allenki <[email protected]>
Date: Thu, 26 Mar 2020 17:26:20 +0530
Subject: usb: gadget: f_fs: Fix use after free issue as part of queue failure

In AIO case, the request is freed up if ep_queue fails. However, io_data->req still has the reference to this freed request. In the case of this failure if there is aio_cancel call on this io_data it will lead to an invalid dequeue operation and a potential use after free issue.
Fix this by setting the io_data->req to NULL when the request is freed as part of queue failure.

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

index 571917677d35..767f30b86645 100644
@@ -1120,6 +1120,7 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
 
 		ret = usb_ep_queue(ep->ep, req, GFP_ATOMIC);
 		if (unlikely(ret)) {
+			io_data->req = NULL;
 			usb_ep_free_request(ep->ep, req);
 			goto error_lock;
 		}

2.26.0