diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2017-12-19 11:14:42 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-19 11:40:54 +0100 |
| commit | 07b9f12864d16c3a861aef4817eb1efccbc5d0e6 (patch) | |
| tree | adbfc9dfdec85e35427fd85d5c4b10eabc09d47d | |
| parent | 6074bc0c850ea58e412c49c05bb12247eb339f53 (diff) | |
USB: Fix off by one in type-specific length check of BOS SSP capability
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: linux-stable <stable@vger.kernel.org>
CC: Masakazu Mokuno <masakazu.mokuno@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/core/config.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index 78e92d29f8d9..c821b4b9647e 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -1007,7 +1007,7 @@ int usb_get_bos_descriptor(struct usb_device *dev) 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; |