This is a note to let you know that I've just added the patch titled usb: gadget: composite: fix OS descriptors w_value logic to the 5.15-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-gadget-composite-fix-os-descriptors-w_value-logic.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ec6ce7075ef879b91a8710829016005dc8170f17 Mon Sep 17 00:00:00 2001 From: Peter Korsgaard <peter@xxxxxxxxxxxxx> Date: Thu, 4 Apr 2024 12:06:35 +0200 Subject: usb: gadget: composite: fix OS descriptors w_value logic From: Peter Korsgaard <peter@xxxxxxxxxxxxx> commit ec6ce7075ef879b91a8710829016005dc8170f17 upstream. The OS descriptors logic had the high/low byte of w_value inverted, causing the extended properties to not be accessible for interface != 0. >From the Microsoft documentation: https://learn.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-os-1-0-descriptors-specification OS_Desc_CompatID.doc (w_index = 0x4): - wValue: High Byte = InterfaceNumber. InterfaceNumber is set to the number of the interface or function that is associated with the descriptor, typically 0x00. Because a device can have only one extended compat ID descriptor, it should ignore InterfaceNumber, regardless of the value, and simply return the descriptor. Low Byte = 0. PageNumber is used to retrieve descriptors that are larger than 64 KB. The header section is 16 bytes, so PageNumber is set to 0 for this request. We currently do not support >64KB compat ID descriptors, so verify that the low byte is 0. OS_Desc_Ext_Prop.doc (w_index = 0x5): - wValue: High byte = InterfaceNumber. The high byte of wValue is set to the number of the interface or function that is associated with the descriptor. Low byte = PageNumber. The low byte of wValue is used to retrieve descriptors that are larger than 64 KB. The header section is 10 bytes, so PageNumber is set to 0 for this request. We also don't support >64KB extended properties, so verify that the low byte is 0 and use the high byte for the interface number. Fixes: 37a3a533429e ("usb: gadget: OS Feature Descriptors support") Cc: stable <stable@xxxxxxxxxx> Signed-off-by: Peter Korsgaard <peter@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20240404100635.3215340-1-peter@xxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/gadget/composite.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1978,7 +1978,7 @@ unknown: buf[5] = 0x01; switch (ctrl->bRequestType & USB_RECIP_MASK) { case USB_RECIP_DEVICE: - if (w_index != 0x4 || (w_value >> 8)) + if (w_index != 0x4 || (w_value & 0xff)) break; buf[6] = w_index; /* Number of ext compat interfaces */ @@ -1994,9 +1994,9 @@ unknown: } break; case USB_RECIP_INTERFACE: - if (w_index != 0x5 || (w_value >> 8)) + if (w_index != 0x5 || (w_value & 0xff)) break; - interface = w_value & 0xFF; + interface = w_value >> 8; if (interface >= MAX_CONFIG_INTERFACES || !os_desc_cfg->interface[interface]) break; Patches currently in stable-queue which might be from peter@xxxxxxxxxxxxx are queue-5.15/usb-gadget-composite-fix-os-descriptors-w_value-logic.patch