This is a note to let you know that I've just added the patch titled USB: Fix off by one in type-specific length check of BOS SSP capability to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-fix-off-by-one-in-type-specific-length-check-of-bos-ssp-capability.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 07b9f12864d16c3a861aef4817eb1efccbc5d0e6 Mon Sep 17 00:00:00 2001 From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Date: Tue, 19 Dec 2017 11:14:42 +0200 Subject: USB: Fix off by one in type-specific length check of BOS SSP capability From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> commit 07b9f12864d16c3a861aef4817eb1efccbc5d0e6 upstream. USB 3.1 devices are not detected as 3.1 capable since 4.15-rc3 due to a off by one in commit 81cf4a45360f ("USB: core: Add type-specific length check of BOS descriptors") It uses USB_DT_USB_SSP_CAP_SIZE() to get SSP capability size which takes the zero based SSAC as argument, not the actual count of sublink speed attributes. USB3 spec 9.6.2.5 says "The number of Sublink Speed Attributes = SSAC + 1." The type-specific length check patch was added to stable and needs to be fixed there as well Fixes: 81cf4a45360f ("USB: core: Add type-specific length check of BOS descriptors") CC: Masakazu Mokuno <masakazu.mokuno@xxxxxxxxx> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/core/config.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -1002,7 +1002,7 @@ int usb_get_bos_descriptor(struct usb_de case USB_SSP_CAP_TYPE: ssp_cap = (struct usb_ssp_cap_descriptor *)buffer; ssac = (le32_to_cpu(ssp_cap->bmAttributes) & - USB_SSP_SUBLINK_SPEED_ATTRIBS) + 1; + USB_SSP_SUBLINK_SPEED_ATTRIBS); if (length >= USB_DT_USB_SSP_CAP_SIZE(ssac)) dev->bos->ssp_cap = ssp_cap; break; Patches currently in stable-queue which might be from mathias.nyman@xxxxxxxxxxxxxxx are queue-4.9/usb-fix-off-by-one-in-type-specific-length-check-of-bos-ssp-capability.patch queue-4.9/usb-xhci-add-xhci_trust_tx_length-for-renesas-upd720201.patch