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

usb: gadget: f_fs: Use config_ep_by_speed()

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: usb-gadget-f_fs-use-config_ep_by_speed.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 675272d092e4a5570bace92593776f7348daf4c5 Mon Sep 17 00:00:00 2001

From: Jack Pham jackp@codeaurora.org Date: Wed, 24 Jan 2018 23:58:20 -0800 Subject: usb: gadget: f_fs: Use config_ep_by_speed()

From: Jack Pham jackp@codeaurora.org

commit 675272d092e4a5570bace92593776f7348daf4c5 upstream.

In commit 2bfa0719ac2a ("usb: gadget: function: f_fs: pass companion descriptor along") there is a pointer arithmetic bug where the comp_desc is obtained as follows:

comp_desc = (struct usb_ss_ep_comp_descriptor *)(ds + USB_DT_ENDPOINT_SIZE);

Since ds is a pointer to usb_endpoint_descriptor, adding 7 to it ends up going out of bounds (7 * sizeof(struct usb_endpoint_descriptor), which is actually 7*9 bytes) past the SS descriptor. As a result the maxburst value will be read incorrectly, and the UDC driver will also get a garbage comp_desc (assuming it uses it).

Since Felipe wrote, "Eventually, f_fs.c should be converted to use config_ep_by_speed() like all other functions, though", let's finally do it. This allows the other usb_ep fields to be properly populated, such as maxpacket and mult. It also eliminates the awkward speed-based descriptor lookup since config_ep_by_speed() does that already using the ones found in struct usb_function.

Fixes: 2bfa0719ac2a ("usb: gadget: function: f_fs: pass companion descriptor along") Cc: stable@vger.kernel.org Signed-off-by: Jack Pham jackp@codeaurora.org Signed-off-by: Felipe Balbi felipe.balbi@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/usb/gadget/function/f_fs.c | 38 ++++++------------------------------- 1 file changed, 7 insertions(+), 31 deletions(-)

--- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -1852,44 +1852,20 @@ static int ffs_func_eps_enable(struct ff

spin_lock_irqsave(&func->ffs->eps_lock, flags); while(count--) { - struct usb_endpoint_descriptor *ds; - struct usb_ss_ep_comp_descriptor *comp_desc = NULL; - int needs_comp_desc = false; - int desc_idx; - - if (ffs->gadget->speed == USB_SPEED_SUPER) { - desc_idx = 2; - needs_comp_desc = true; - } else if (ffs->gadget->speed == USB_SPEED_HIGH) - desc_idx = 1; - else - desc_idx = 0; - - /* fall-back to lower speed if desc missing for current speed */ - do { - ds = ep->descs[desc_idx]; - } while (!ds && --desc_idx >= 0); - - if (!ds) { - ret = -EINVAL; - break; - } - ep->ep->driver_data = ep; - ep->ep->desc = ds;

- if (needs_comp_desc) { - comp_desc = (struct usb_ss_ep_comp_descriptor *)(ds + - USB_DT_ENDPOINT_SIZE); - ep->ep->maxburst = comp_desc->bMaxBurst + 1; - ep->ep->comp_desc = comp_desc; + ret = config_ep_by_speed(func->gadget, &func->function, ep->ep); + if (ret) { + pr_err("%s: config_ep_by_speed(%s) returned %d\n", + __func__, ep->ep->name, ret); + break; }

ret = usb_ep_enable(ep->ep); if (likely(!ret)) { epfile->ep = ep; - epfile->in = usb_endpoint_dir_in(ds); - epfile->isoc = usb_endpoint_xfer_isoc(ds); + epfile->in = usb_endpoint_dir_in(ep->ep->desc); + epfile->isoc = usb_endpoint_xfer_isoc(ep->ep->desc); } else { break; }

Patches currently in stable-queue which might be from jackp@codeaurora.org are

queue-4.15/usb-gadget-f_fs-use-config_ep_by_speed.patch queue-4.15/usb-gadget-f_fs-process-all-descriptors-during-bind.patch