linux-kernel - [PATCH 4.9 67/75] USB: Fix off by one in type-specific length check of BOS SSP capability

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Date:   Mon,  1 Jan 2018 15:32:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Masakazu Mokuno <masakazu.mokuno@...il.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [PATCH 4.9 67/75] USB: Fix off by one in type-specific length check of BOS SSP capability

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mathias Nyman <mathias.nyman@...ux.intel.com>

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@...il.com>
Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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;