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USB: core: Add type-specific length check of BOS descriptors 

commit 81cf4a45360f70528f1f64ba018d61cb5767249a upstream.

As most of BOS descriptors are longer in length than their header
'struct usb_dev_cap_header', comparing solely with it is not sufficient
to avoid out-of-bounds access to BOS descriptors.

This patch adds descriptor type specific length check in
usb_get_bos_descriptor() to fix the issue.

Signed-off-by: Masakazu Mokuno <masakazu.mokuno@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.16: drop handling of USB_PTM_CAP_TYPE and USB_SSP_CAP_TYPE]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Masakazu Mokuno 2017-11-10 01:25:50 +09:00 committed by syphyr
parent 5203cd7a0e
commit ded0acf2fb
2 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/core/config.c
View File

@ -852,6 +852,13 @@ void usb_release_bos_descriptor(struct usb_device *dev)
}
}
static const __u8 bos_desc_len[256] = {
[USB_CAP_TYPE_WIRELESS_USB] = USB_DT_USB_WIRELESS_CAP_SIZE,
[USB_CAP_TYPE_EXT] = USB_DT_USB_EXT_CAP_SIZE,
[USB_SS_CAP_TYPE] = USB_DT_USB_SS_CAP_SIZE,
[CONTAINER_ID_TYPE] = USB_DT_USB_SS_CONTN_ID_SIZE,
};
/* Get BOS descriptor set */
int usb_get_bos_descriptor(struct usb_device *dev)
{
@ -860,6 +867,7 @@ int usb_get_bos_descriptor(struct usb_device *dev)
struct usb_dev_cap_header *cap;
unsigned char *buffer;
int length, total_len, num, i;
__u8 cap_type;
int ret;
bos = kzalloc(sizeof(struct usb_bos_descriptor), GFP_KERNEL);
@ -912,7 +920,13 @@ int usb_get_bos_descriptor(struct usb_device *dev)
dev->bos->desc->bNumDeviceCaps = i;
break;
}
cap_type = cap->bDevCapabilityType;
length = cap->bLength;
if (bos_desc_len[cap_type] && length < bos_desc_len[cap_type]) {
dev->bos->desc->bNumDeviceCaps = i;
break;
}
total_len -= length;
if (cap->bDescriptorType != USB_DT_DEVICE_CAPABILITY) {
@ -920,7 +934,7 @@ int usb_get_bos_descriptor(struct usb_device *dev)
continue;
}
switch (cap->bDevCapabilityType) {
switch (cap_type) {
case USB_CAP_TYPE_WIRELESS_USB:
/* Wireless USB cap descriptor is handled by wusb */
break;

2
include/uapi/linux/usb/ch9.h
View File

@ -815,6 +815,8 @@ struct usb_wireless_cap_descriptor { /* Ultra Wide Band */
__u8 bReserved;
} __attribute__((packed));
#define USB_DT_USB_WIRELESS_CAP_SIZE 11
/* USB 2.0 Extension descriptor */
#define USB_CAP_TYPE_EXT 2